Thyroid Hair Loss: Can Thyroid Cause Hair Loss?

Thyroid Hair Loss occurs when the thyroid gland produces either too much or too little hormone, disturbing the natural hair cycle. The thyroid is located in the lower neck and releases thyroxine (T4) and triiodothyronine (T3), which control metabolism, energy regulation, and cellular function. Thyroid hormones influence hair follicles by initiating growth and managing the duration of resting and shedding phases. Hormonal imbalance disrupts follicular activity, resulting in thinning, brittle strands, and excessive shedding. The close link between thyroid and hair loss is due to the direct role of thyroid hormones in hair follicle function.

Hair loss from thyroid imbalance appears as diffuse thinning across the scalp. The answer to the question “Can Thyroid Cause Hair Loss?” is yes. Thyroid dysfunction triggers widespread hair loss by shortening the growth phase and pushing follicles into early rest. Hypothyroidism was found to be a significant cause of telogen effluvium, with 34% of affected individuals experiencing severe hair loss, according to “Is thyroid dysfunction a common cause of telogen effluvium?: A retrospective study” by Alabdulaziz et al., 2024. The study showed a higher average severity score among hypothyroid patients compared to individuals with normal thyroid levels.

Thyroid hormones bind to receptors in hair follicle cells to stimulate growth and regulate shedding. Disruption results in thyroid symptoms hair loss (dry strands, thinning, brittle texture, and loss of the outer eyebrow). Hypothyroidism causes coarse hair, while hyperthyroidism results in fine, silky strands. Autoimmune thyroid disorders trigger patchy hair loss (Alopecia Areata).

Does Thyroid Hair Loss Regrow?
Hair regrows once hormone levels stabilize with proper medical care. Regrowth takes several months, and the new hair differs in texture or color. However, full recovery depends on how early treatment begins and the body’s response to hormone regulation.

Hair thinning from thyroid issues appears evenly across the scalp, with noticeable shedding during grooming. Hypothyroidism leads to dry, coarse hair and possible eyebrow thinning, while hyperthyroidism produces soft, fine strands. Weight changes, fatigue, and mood shifts are common symptoms of hair loss due to thyroid issues. Autoimmune thyroid conditions cause patchy loss (Alopecia Areata). Thyroid hair loss treatment focuses on restoring hormone balance using medications (levothyroxine or antithyroid drugs) along with possible iodine therapy or surgery. Recovery takes time, supported by a healthy diet, gentle hair care, and proper medical evaluation.

How Does the Thyroid Cause Hair Loss?

The thyroid causes hair loss by disrupting the balance of hormones that control the hair growth cycle. Imbalanced thyroid hormone levels shift more hair follicles into the resting (telogen) phase, reducing active growth and leading to shedding. Hair becomes thinner when fewer follicles remain in the growth (anagen) phase. Thyroid hormones regulate energy production and influence cellular activity in hair follicles. Receptors for thyroid hormones are located in the cells of the hair bulb and surrounding structures, showing direct control over hair health. Proper levels of triiodothyronine (T3) support hair survival and help maintain normal follicular function.

Iodine is a critical component for producing thyroid hormones. The thyroid gland relies on iodine to synthesize thyroxine (T4) and triiodothyronine (T3). Daily iodine intake must reach specific levels to meet hormonal production needs, including 100 to 150 µg for adults. Inadequate iodine intake leads to reduced hormone levels, triggering metabolic disturbances that affect hair follicles. Untreated hypothyroidism and hyperthyroidism result in uniform scalp hair thinning. Hair appears sparse due to the increased number of follicles entering the shedding phase. Proper treatment of thyroid disorders restores hormone balance and supports gradual hair regrowth.

Thyroid dysfunction contributes to hair loss due to thyroid conditions (Telogen Effluvium). Increased telogen-to-anagen ratios alter regular follicle activity, reducing density and volume. The thyroid and hair loss link is confirmed by evidence of hormonal influence on follicle stem cells and skin structure. Thyroid dysfunction was identified as a significant cause of Telogen Effluvium, according to “Is thyroid dysfunction a common cause of telogen effluvium?: A retrospective study,” Almohawis et al., 2024.  The study of 500 women with TE revealed higher severity scores in women with hypothyroidism, emphasizing the need for thyroid function testing in diagnosing hair loss.

Where Does Thyroid Hair Thinning Usually Occur?

Thyroid hair thinning usually occurs on the scalp and the outer third of the eyebrows. Thinning begins at the temples, crown, and frontal hairline, resulting in a general diffuse pattern across the scalp. The eyebrows’ outer edge is a distinct location regularly affected by hypothyroidism. Hair loss extends to other body areas (eyelashes and underarms), though less commonly.

Marked thinning of scalp and eyebrow hair has been observed in thyroid-related hair loss, according to “Diffuse Thinning of Hair in Iodide‐Induced Hypothyroidism” by J.A. Gordon and D.J.B. Ashley (1967). Eyebrow loss, particularly on the outer edges, is supported by findings in “Hair Growth and Alopecia in Hypothyroidism” by Freinkel et al. (1972).

Is Thyroid Hair Loss Common in the Eyebrows?

Yes, thyroid hair loss is common in the eyebrows. Thinning impacts the outer third of the eyebrows (Queen Anne or Hertoghe sign). Eyebrow hypotrichosis results from hypothyroidism, though hyperthyroidism contributes to the condition in cases involving autoimmune thyroid diseases (Graves’ disease), where excessive thyroid hormone production disrupts normal hair follicle function. Hormonal imbalance disrupts the growth cycle and weakens follicles, leading to thyroid eyebrow hair loss. Hair becomes coarse, brittle, dry, and prone to breakage. Regrowth occurs after thyroid levels return to normal through treatment, though recovery takes several months.

Can Too Much Iodine Cause Hair Loss?

Yes, too much iodine can cause hair loss. Prolonged excessive iodine intake leads to thyroid dysfunction, particularly hyperthyroidism (overactive thyroid), where the thyroid produces an abnormally high level of hormones. Elevated hormone levels disrupt the hair growth cycle and cause diffuse thinning across the scalp. Excessive iodine intake through supplements, contrast agents used in imaging procedures, or diets high in iodine-rich seaweed are common causes of thyroid dysfunction that result in hair loss.

Iodine supports the production of thyroxine (T4) and triiodothyronine (T3), hormones essential for metabolic function, skin maintenance, and hair follicle regulation. An imbalance in iodine intake (too low or too high) affects thyroid hormone output, leading to hypothyroidism or hyperthyroidism, which results in significant hair loss.

Iodine remains essential for hair regrowth by enabling proper thyroid hormone function (critical for follicle health and cell regeneration). A balanced iodine intake promotes healthy hormone levels, preventing hair loss and supporting regrowth. The recommended daily intake is 150 micrograms for adults (220 to 290 micrograms for pregnant or breastfeeding women). Iodine-rich foods are iodized salt, fish (cod, haddock, sea bass), dairy products, seaweed, and crops grown in iodine-rich soil. Supplements are unnecessary without a diagnosed deficiency, as excess intake increases the risk of thyroid-related hair loss.

What Does Hair Look like Before and After Thyroid Hair Loss?

Hair looks thick, shiny, and evenly distributed across the scalp before thyroid hair loss, with smooth texture and healthy volume. Eyebrows appear complete and well-defined without gaps along the outer edges. The hair looks thin, dry, and brittle, with reduced volume and increased breakage, after thyroid hair loss. Thinning spreads uniformly across the scalp without forming patches. Eyebrow loss becomes noticeable along the outer third, leaving sparse or bare sections.

Thyroid hair loss pictures female show diffuse scalp thinning and breakage. Thyroid eyebrow hair loss pictures highlight visible thinning or loss at the outer edges of the eyebrows. Before and after thyroid hair loss pictures clearly show the contrast between full, healthy hair and the weakened, sparse appearance following thyroid dysfunction.

What Types of Thyroid Conditions Cause Hair Loss?

The types of thyroid conditions that cause hair loss are hypothyroidism, hyperthyroidism, and autoimmune thyroid disorders (Hashimoto’s thyroiditis). Each thyroid condition affects the balance of thyroid hormones, which are essential for healthy hair growth. Hormonal imbalance disrupts the normal hair cycle and leads to diffuse hair shedding across the scalp without creating distinct bald patches.

Hypothyroidism (underactive thyroid) causes slow-growing, coarse, dry, and brittle hair. Thinning appears evenly across the scalp and includes loss of the outer third of the eyebrows. Hashimoto’s thyroiditis is a leading cause of hypothyroidism and contributes to thyroid-related hair thinning.

Hyperthyroidism (overactive thyroid) leads to fine, silky hair and diffuse hair shedding. Around 50% of individuals with hyperthyroidism experience hair loss. Elevated thyroid hormone levels and increased oxidative stress damage hair follicle cells and weaken hair structure.

Drug-induced hypothyroidism is another contributor to hair loss. Shedding results from medications (lithium) or in patients undergoing chronic dialysis. Thyroid function tests are necessary to determine underlying causes.

Thyroid-related hormone imbalance is associated with multiple types of hair loss. Telogen effluvium (TE) involves excessive shedding caused by disrupted thyroid hormone levels. Alopecia Areata (AA) is a patchy hair loss condition, and is more common in individuals with autoimmune thyroid diseases. Androgenetic Alopecia (AGA) is female pattern hair loss, which correlates with thyroid dysfunction in women with hypothyroidism.

How Does Hypothyroidism Cause Hair Loss?

Hypothyroidism causes hair loss by impairing the function of hair follicles and disrupting the natural hair growth cycle. Low thyroid hormone levels reduce the division of epidermal and follicular cells, resulting in coarse, brittle, and dry hair. A greater number of follicles remain in the telogen (resting) phase instead of returning to the anagen (growth) phase. Prolonged imbalance leads to telogen effluvium, a type of diffuse shedding commonly seen in hypothyroidism hair loss.

Hair thinning from hypothyroidism affects the entire scalp and includes the outer third of the eyebrows. Slowed metabolism from hormone deficiency weakens hair structure and delays regrowth. Thyroid hormone therapy restores hair follicle cycling by reducing telogen-phase hairs and supporting new growth, according to “Hair growth and alopecia in hypothyroidism,” Archives of Dermatology, Freinkel, R. K. (1972).

Hyperthyroidism produces excess thyroid hormones that overstimulate the body and contribute to hair loss. Fine, silky hair with diffuse thinning occurs during periods of hormonal excess. Increased metabolic demand diverts nutrients away from follicles, weakening their structure and triggering hair shedding.

A retrospective study involving 500 female telogen effluvium patients confirmed that the hypothyroid group had higher severity of alopecia tool (SALT) scores than the euthyroid and hyperthyroid groups. The study demonstrated a strong association between hypothyroidism and telogen effluvium, according to “Is thyroid dysfunction a common cause of telogen effluvium?” by Tarek Atia, Salman Bin Dayel, Othman Abahussein, Rand Al Yahya, Shereen Elsayed, and Ramadan Hussein (2024).

How Does Hyperthyroidism Cause Hair Loss?

Hyperthyroidism causes hair loss by disrupting the balance of thyroid hormones that control the hair growth cycle. Elevated hormone levels accelerate metabolic processes in hair follicles, leading to diffuse hair shedding across the scalp. Around 50% of individuals with hyperthyroidism hair loss encounter non-scarring thinning that affects hair density.

Hyperthyroidism impacts hair follicles by increasing the production of reactive oxygen species (ROS), which triggers oxidative stress. Oxidative stress damages hair follicle cells and weakens the hair shaft. Thyroid hormones influence cellular activity in the hair bulb (keratin production and matrix cell division), which are essential for maintaining hair strength and growth.

The hair growth cycle involves anagen (growth), catagen (regression), and telogen (resting) phases. Hyperthyroidism shortens the anagen phase and increases the transition to the telogen phase, resulting in telogen effluvium. Hair shedding becomes more frequent, and hair density decreases across the scalp and eyebrow areas. Follicles exposed to prolonged hormonal imbalance struggle to return to active growth.

Thyrotoxicosis (a severe form of hyperthyroidism) causes fine, silky hair and widespread thinning. In vitro studies demonstrate improved cell cycling in hair bulbs exposed to excessive thyroid hormones, leading to increased turnover and reduced shaft quality. Changes include lower tensile strength and thinner strands.

Increased follicular activity in thyrotoxic patients has been reported, according to “Cell cycle kinetics of human anagen scalp hair bulbs in thyroid disorders determined by DNA flow cytometry,” by Schell, Kiesewetter, Seidel, and von Hintzenstern (1991). A larger retrospective study, “Is thyroid dysfunction a common cause of telogen effluvium?” by Mohamed Alajmi et al. (2024), found no significant difference in hair loss severity between euthyroid and hyperthyroid patients.

How Does Hashimoto Cause Hair Loss?

Hashimoto causes hair loss by reducing thyroid hormone levels through autoimmune damage to the thyroid gland. The immune system targets thyroid tissue, which leads to inflammation and impaired production of triiodothyronine (T3) and thyroxine (T4). Reduced hormone availability disrupts metabolic processes in hair follicles and leads to Hashimoto’s hair loss, a condition marked by diffuse thinning across the scalp and eyebrows.

Hair follicles require thyroid hormones to regulate the hair growth cycle. T3 and T4 influence the shift between anagen (growth), catagen (transition), and telogen (shedding) phases. Hormonal deficiency in Hashimoto hair loss increases the number of follicles in the telogen phase, resulting in widespread shedding. Hair strands become dry, coarse, and brittle due to decreased sebum production and slowed follicular activity.

Hair loss from Hashimoto’s is diagnosed as Telogen Effluvium, a condition where up to 70 percent of scalp hairs shed within a short period. The density of hair decreases over time, and follicles remain inactive for long periods, delaying regrowth. Eyebrow thinning commonly appears along the outer edge.

Hair loss affects approximately 33 percent of individuals with hypothyroidism. A review titled “Impact of Thyroid Dysfunction on Hair Disorders” (Cureus, Marwa M. Matar et al., 2023) reports that around 5 percent of Alopecia Areata patients have subclinical hypothyroidism linked to Hashimoto’s thyroiditis. The study emphasizes the connection between autoimmune thyroid conditions and chronic hair disorders.

How Does Graves Disease Cause Hair Loss?

Graves’ Disease causes hair loss by disrupting the balance of thyroid hormones that regulate the hair growth cycle. Overproduction of T3 and T4 hormones pushes hair follicles to exit the growth phase (anagen) prematurely and enter the resting phase (telogen), leading to excessive shedding and thinning across the scalp. Hair becomes delicate, weak, and breaks easily due to reduced tensile strength in the strands.

Thyroid hormones control follicle metabolism, cellular growth, and regeneration. High hormone levels interfere with normal follicle function, resulting in fewer hairs entering the active growth phase. Affected individuals commonly experience hair loss during routine grooming activities (washing or brushing).

Anagen hairs in patients with hyperthyroidism show increased activity in the S and G2 + M stages of the cell cycle, according to “Cell cycle kinetics of human anagen scalp hair bulbs in thyroid disorders determined by DNA flow cytometry” by Schell H, Kiesewetter F, Seidel C, von Hintzenstern J (1991). The pattern of Graves disease hair loss reflects the direct impact of hormonal imbalance on hair follicle behavior and growth timing.

What Are the Symptoms of Thyroid Problems in Hair?

The symptoms of thyroid problems in hair are listed below.

• Diffuse Hair Loss: Hair appears evenly thin across the entire scalp, without clear bald spots. The pattern results from more hair follicles entering the resting phase (telogen), reducing volume. The condition is a typical sign of Thyroid Symptoms Hair Loss, linked to hypothyroidism and hyperthyroidism.
• Thinning Hair: Hair becomes visibly finer and less dense. The scalp begins to show through along the part line or crown. Disrupted hormone levels prevent normal replenishment of shed hairs, reducing coverage.
• Coarse, Dry, and Brittle Hair: Hair feels rough, dry to the touch, and breaks easily. The ends split, and the strands lose natural shine. Hypothyroidism causes reduced cellular turnover, which weakens the structure of the hair shaft.
• Fine, Soft Hair with Excessive Shedding: Hair takes on a silky, limp texture and sheds excessively during washing or brushing. The condition occurs in hyperthyroidism, where accelerated metabolism affects hair follicle strength and stability.
• Slow Hair Growth: Hair takes longer to grow back after shedding. Normal growth cycles are delayed, and fewer follicles remain in the active growth phase (anagen). Slowed cellular activity caused by thyroid hormone imbalance impacts regeneration.
• Loss of Eyebrow Hair: The outer third of the eyebrows appears thin or missing. The specific sign is associated with hypothyroidism and serves as a visual marker for thyroid hair loss.
• Dry, Itchy Scalp and Dandruff: The scalp becomes flaky and irritated. Inflammation and dryness result from reduced sebum production and impaired skin renewal processes linked to thyroid dysfunction.
• Less Hair on Legs, Arms, and Other Areas: Hair on the limbs and other body areas becomes sparse. The reduction in body hair density reflects systemic hormonal imbalance affecting hair growth beyond the scalp.
• Texture and Color Changes After Regrowth: New hair grows back with a different texture or color. Regrowth after thyroid treatment does not constantly match the original hair characteristics, showing the effect of hormone fluctuation on pigment and structure.
• Delayed Onset of Hair Loss: Hair shedding begins several months after the thyroid condition starts. The delay results from the natural timing of the hair growth cycle, causing confusion about the source of the problem.
• Temporary Hair Loss with Potential for Regrowth: Hair loss due to thyroid disorders is reversible. Proper medical treatment helps restore hormone levels, allowing hair to regrow over several months, although full recovery does not consistently occur.
• Signs of Autoimmune-Linked Hair Loss: Patients with autoimmune thyroid conditions develop other autoimmune-related hair disorders. Alopecia Areata (patchy hair loss) is more frequent in individuals with autoimmune thyroid diseases.
• Scalp Sensitivity or Inflammation: The scalp feels tender or inflamed during flare-ups of thyroid imbalance. Sensitivity accompanies shedding, indicating underlying skin or follicle stress.
• Risk from Inappropriate Supplements: High intake of biotin or iodine worsens thyroid hormone regulation or interferes with lab test accuracy. Supplement use must be monitored to avoid misdiagnosis or worsened hair loss symptoms.

Is Thyroid Hair Loss More Common in Men or Women?

Thyroid hair loss is more common in women than in men. Women are 5 to 8 times more likely to develop thyroid disorders, according to the American Thyroid Association. Thyroid dysfunction has been identified in 35% of women with alopecia, compared to 13% of men. Hormonal changes, autoimmune thyroid diseases, and iodine deficiency contribute to the higher incidence among females. The condition of thyroid hair loss female presents during menopause or periods of hormonal fluctuation.

Men with thyroid conditions experience thyroid male hair loss, although with lower frequency. Hair loss in men with thyroid dysfunction appears as diffuse thinning, similar to telogen effluvium patterns.

Lupus occurs most frequently in women of childbearing age. Diagnoses commonly appear between 15 and 44 years old, according to the Centers for Disease Control and Prevention. Peak incidence for women occurs between 20 and 25 years old (3.6 per 100,000 person-years), followed by another peak during menopause (2.6 per 100,000 person-years), according to Age-specific and sex-specific incidence of systemic lupus. Children account for 10% to 20% of lupus cases, with an incidence below 1 per 100,000, according to Understanding the Epidemiology and Progression of Systemic Lupus Erythematosus. Men commonly experience lupus onset around age 40, with peak incidence between 65 and 70 years (2.2 per 100,000 person-years), according to HSS Rheumatology.

What Are the Thyroid Hair Loss Treatments?

The thyroid hair loss treatments are listed below.

• Methimazole: Methimazole treats hyperthyroidism by blocking thyroperoxidase, which reduces thyroid hormone synthesis. Restoration of normal hormone levels through methimazole improves hair regrowth by correcting the overactive thyroid state. An 84% remission rate was observed after five years of methimazole therapy in patients with Graves’ disease, according to “Increased Remission Rates After Long-Term Methimazole Therapy in Patients with Graves’ Disease: Results of a Randomized Clinical Trial” (Azizi F, Amouzegar A, Tohidi M, et al., 2019). Methimazole combined with levothyroxine proved more effective in children than methimazole alone, based on Methimazole plus levothyroxine for treating hyperthyroidism in children: a systematic review and meta-analysis (Wu X, Qin X, Yao Y, 2022).
• Levothyroxine: Levothyroxine is a synthetic T4 hormone used to treat hypothyroidism. Proper dosing normalizes hormone levels and restores hair regrowth within 3 to 6 months. An infant with diffuse scalp hair loss showed improvement after levothyroxine dose reduction, confirming drug-induced anagen effluvium, according to Diffuse scalp hair loss due to levothyroxine overdose (Chandra M, et al., 2015). Reduced improvement in thyroid function was noted in men with early-onset androgenetic alopecia, according to “The impact of levothyroxine on thyroid autoimmunity and hypothalamic-pituitary-thyroid axis activity (Celiński A, et al., 2021).”
• Minoxidil: Minoxidil is a topical solution approved for hair growth. It extends the anagen phase, enlarges hair follicles, and improves hair shaft thickness. It is commonly used in conjunction with other therapies to strengthen scalp coverage in thyroid-related hair loss cases.
• Platelet-Rich Plasma (PRP) Therapy: PRP therapy uses concentrated plasma derived from the patient’s blood to promote hair regeneration. A clinical improvement of 20.5% in mean hair count was recorded after three months of treatment, according to Rezak H, et al.
• Dietary and Lifestyle Adjustments: Nutrient-rich foods (iron, zinc, vitamins A, B complex, C, D, and E) support healthy follicles. Oily fish, leafy greens, biotin-rich foods, and protein contribute to hair strength and growth. Avoiding chemical treatments and heat tools reduces damage.
• Kelp Supplements: Kelp provides iodine, which supports thyroid hormone production. However, excess iodine from kelp worsens hypothyroidism and interferes with levothyroxine treatment. Kelp must not be consumed without medical supervision.

Hair transplant procedures offer a surgical hair loss treatment for patients with advanced thyroid-related hair thinning. Individuals with stabilized thyroid function are eligible for a hair transplant. Transplantation relocates healthy hair to bald areas but does not increase follicle count. Hormonal stability must be ensured before the procedure to avoid graft failure. Hair transplant success depends on existing follicle health, disease control, and the surgeon’s expertise.

How Does Methimazole Treat Thyroid Hair Loss?

Methimazole treats thyroid hair loss by reducing excessive thyroid hormone levels caused by hyperthyroidism. The medication inhibits thyroid peroxidase (TPO), an enzyme responsible for producing thyroxine (T4) and triiodothyronine (T3). Balanced hormone levels restore normal thyroid function and stabilize the hair growth cycle. Thyroid hormone imbalance forces hair follicles into a resting phase (telogen), which leads to shedding. Hormone correction through Methimazole allows follicles to return to the active growth phase (anagen), reducing further hair loss.

Methimazole is prescribed for hyperthyroidism, including conditions such as Graves’ disease and toxic multinodular goiter. Patients use Methimazole before undergoing thyroid surgery or radioactive iodine therapy. Early improvement in hair shedding appears within three weeks, though full recovery of hair growth occurs within 6 to 8 months after achieving euthyroid status. A randomized clinical trial reported an 84% remission rate for patients with Graves’ disease after long-term Methimazole therapy, according to “Increased Remission Rates After Long-Term Methimazole Therapy in Patients with Graves’ Disease, (Azizi F, Amouzegar A, Tohidi M, et al., 2019).

Does Methimazole Cause Hair Loss?
Yes, Methimazole causes hair loss in a few individuals. Hair loss is listed as a potential side effect and result of the medication or the thyroid condition being treated. An FDA-controlled phase IV trial found that 2.4% of 7,420 patients taking Methimazole reported hair loss, according to eHealthMe (2022). Most cases were reported in females, older adults, and individuals taking the drug alongside other treatments (chemotherapy). Hair loss related to Methimazole is temporary and resolves as the body adjusts to the medication. The type of shedding is linked to telogen effluvium, where stress or hormonal shifts push hair into the resting phase. Monitoring by a healthcare provider helps manage side effects and determine if dosage adjustments are necessary.

How Does Levothyroxine Treat Thyroid Hair Loss?

Levothyroxine treats thyroid hair loss by restoring normal thyroid hormone levels in individuals with hypothyroidism. Low levels of thyroxine disrupt the hair growth cycle, leading to shortened growth phases and increased shedding. Levothyroxine stabilizes hormone levels, allowing hair follicles to re-enter the anagen (growth) phase and supporting new hair production.

Treatment success with levothyroxine becomes visible within three to six months, once TSH levels return to the normal range. Hair regrowth varies by individual and shows differences in texture or thickness. Clinical reports, including one involving a juvenile patient, observed noticeable hair improvement within two months after initiating levothyroxine therapy (Chandra M, et al., 2015).

Levothyroxine is prescribed when thyroid hormone deficiency is confirmed through laboratory testing. Patients with hypothyroidism commonly experience fatigue, weight gain, and hair thinning. Replacing the missing hormone prevents continued hair loss and supports metabolic stability.

Does levothyroxine cause hair loss?
Levothyroxine leads to temporary hair loss during the initial stages of treatment. Hair shedding reflects the adjustment of the hair cycle to normalized hormone levels. A high dose of levothyroxine contributes to excessive hair loss by mimicking hyperthyroid conditions. Monitoring thyroid function regularly ensures proper dosing. Patients asking “How can I prevent hair loss while taking levothyroxine?” must avoid abrupt dosage changes, limit biotin or iodine intake without medical guidance, and follow regular checkups to maintain hormonal balance.

What Are Best Shampoos for Thyroid Hair Loss?

The best shampoos for Thyroid Hair Loss are listed below.

• Briogeo Destined for Density Caffeine + Biotin Density Shampoo: Briogeo is a powerful shampoo for thyroid hair loss that reduces hair breakage and supports regrowth using biotin, zinc, copper peptides, and an Energy Complex that includes caffeine and CoQ10. The formula improves nutrient delivery to the scalp and strengthens hair follicles. Biotin increases elasticity, while copper peptides help regulate the hair growth cycle. Individuals with thyroid-related hair thinning benefit from improved density and early signs of regrowth, making the shampoo an essential hair loss treatment.
• Vegamour GRO+ Advanced Balancing Shampoo: Vegamour shampoo reduces shedding and builds stronger hair strands using GROActive+ Complex™. The formula exfoliates the scalp and supports the transition from the resting to the growth phase in the hair cycle. Scalp balance is critical in thyroid-induced thinning, and Vegamour offers consistent support by improving follicle performance and reducing visible hair loss.
• BondiBoost HG Shampoo: BondiBoost shampoo uses aloe vera, rosemary, and saw palmetto to cleanse the scalp and control oil without stripping moisture. The product targets shedding and encourages new hair growth by supporting a healthy scalp environment. People with thyroid-related hair thinning experience less hair fall and stronger strands, making it an effective hair loss treatment for maintaining scalp balance and promoting visible thickness.
• Nioxin System 1 Shampoo: Nioxin shampoo contains peppermint oil, niacinamide, and caffeine to cleanse buildup and stimulate circulation in the scalp. The formula strengthens hair from the root and increases overall fullness. Individuals with thyroid-related thinning benefit from improved volume and stronger follicle anchoring during the early stages of hair loss.
• Kérastase Densifique Shampoo: Kérastase shampoo features hyaluronic acid and ceramides to hydrate and reinforce hair shafts deeply. The formula reduces breakage and supports volume restoration. Individuals with dry, brittle hair caused by thyroid imbalance find improved hair texture and strength, making it a valuable hair loss treatment for achieving denser, more resilient hair.
• Fable & Mane Volumizing Shampoo: Fable & Mane shampoo relies on Ayurvedic ingredients (fenugreek and onion juice) to fortify hair and minimize breakage. The formula supports scalp stimulation and improves strand thickness. People experiencing thyroid-induced hair thinning gain fuller texture and visible volume through regular use of the plant-based, affordable option.

What Are Best Vitamins for Thyroid Hair Loss?

The best vitamins for thyroid hair loss are listed below.

• Vitamin B Complex: Vitamin B Complex supports healthy hair growth by regulating thyroid hormone production and improving cellular metabolism. Each B vitamin contributes to cell energy, development, and repair. Biotin (B7) is essential for keratin production, which forms the structure of hair. B vitamins help regulate hormonal balance, making them vital in managing thyroid-related hair loss and maintaining scalp and follicle health.
• Vitamin C: Vitamin C strengthens hair by supporting collagen synthesis and improving iron absorption, which is vital for follicle health. Antioxidant properties protect thyroid tissue and hair cells from oxidative damage. Vitamin C assists in hormone regulation, supporting a healthy environment for consistent hair growth and follicle strength.
• Vitamin D: Vitamin D regulates the hair growth cycle by stimulating new follicle development and promoting proper cell differentiation. Deficiency is frequently linked to hair thinning in thyroid disorders. Adequate Vitamin D supports immune balance and strengthens follicles, which helps reverse hair shedding in hypothyroidism and autoimmune thyroid disease.
• Vitamin E: Vitamin E promotes blood flow to the scalp and protects follicles from oxidative stress. It supports the conversion of T4 to T3, the active thyroid hormone, helping stabilize hormonal activity. Improved cellular repair and improved nutrient delivery contribute to stronger, more resilient hair in individuals experiencing thyroid-related hair thinning.
• Iron: Iron delivers oxygen to hair follicles, enabling energy production and growth at the cellular level. It is necessary for the synthesis of thyroid hormones. Iron deficiency contributes to shedding by weakening the follicle base in hypothyroidism. Restoring iron levels strengthens strands and supports sustained hair regrowth.
• Zinc: Zinc supports keratin production and regulates thyroid enzyme activity. It contributes to cell replication and tissue repair, which is crucial for the hair cycle. A balanced zinc level maintains hormonal stability and reduces inflammation, helping reduce the progression of hair loss associated with thyroid dysfunction.
• Selenium: Selenium assists in the activation of thyroid hormones and reduces autoimmune attacks on the thyroid gland. It helps protect cells from free radical damage and supports tissue healing. Selenium improves follicle function by regulating metabolic processes and decreasing antibody levels in conditions (Hashimoto’s or Graves’ disease).

How to Stop Hair Full due to Thyroid Naturally

To stop hair fall due to thyroid naturally, follow the 13 steps listed below.

1. Improve Nutrient Intake. Eat whole foods rich in iron, zinc, selenium, and B vitamins to support thyroid function and strengthen hair follicles. Include leafy greens, oily fish, nuts, eggs, and seeds to support nutrient absorption and improve scalp health. Choose anti-inflammatory options (turmeric and ginger) to reduce oxidative stress.
2. Balance Iodine Levels Carefully. Consume iodine-rich foods (dairy, eggs, and fish) in moderate amounts. Avoid high-iodine seaweeds (kelp) if dealing with autoimmune thyroid disorders, to prevent hormone imbalance. Monitor intake based on thyroid condition and current treatment.
3. Avoid Inflammatory Foods. Eliminate processed sugars, red meat, and fried food from the diet to minimize inflammation that worsens thyroid hair falling out. Replace with nutrient-dense whole grains, legumes, and fresh vegetables for improved scalp condition and follicle function.
4. Separate Calcium and Thyroid Medication. Take calcium-rich food or supplements at least four hours apart from levothyroxine to avoid interference with absorption. Improve medication effectiveness to stabilize hormone levels and improve hair retention.
5. Reduce Caffeine and Alcohol Consumption. Limit intake of caffeine and alcohol to avoid disrupting thyroid function and increasing stress hormone levels. Support hormone stability as part of an effective thyroid hair fall solution.
6. Manage Stress Regularly. Practice yoga, meditation, or breathing exercises to lower cortisol levels and protect hair growth cycles. Engage in calming hobbies and avoid high-stress environments to reduce hormonal disturbances linked to hair shedding.
7. Sleep Consistently. Maintain 7 to 8 hours of quality sleep nightly to help the body regulate hormone production and repair damaged follicles. Follow a regular bedtime schedule to support circadian balance and follicle health.
8. Avoid Tight Hairstyles. Stop tying hair tightly in braids, buns, or ponytails that stress the roots and cause breakage. Preserve follicle strength and reduce tension-related loss.
9. Use Gentle Combing Techniques. Detangle with a wide-toothed comb to prevent breakage and avoid pulling out weakened strands. Protect the scalp and reduce daily mechanical stress on fragile hair.
10. Massage the Scalp Daily. Stimulate blood flow with gentle circular massages for 5 to 10 minutes to increase oxygen and nutrient delivery to hair follicles. Support new growth and strengthen existing hair strands.
11. Apply Essential Oils. Use rosemary, lavender, or peppermint oil to activate circulation and encourage hair regrowth. Combine with carrier oils for regular scalp treatments to nourish and protect the skin.
12. Incorporate Coconut Oil. Consume one tablespoon of coconut oil or use it as a hot oil treatment to moisturize the scalp, improve circulation, and support hair shaft strength.
13. Use Evening Primrose Oil. Apply evening primrose oil on the scalp or take in capsule form to benefit from Gamma-Linolenic Acid (GLA), which helps regulate hormones and supports scalp recovery and follicle repair.

Unnatural ways to stop hair fall due to thyroid imbalance involve applying high-strength synthetic serums formulated for instant hair thickening, using artificial hair fibers to cover scalp visibility, and undergoing scalp micropigmentation to imitate hair density. Heat-based styling tools inflate volume temporarily, though frequent exposure weakens strands. Hair extensions and wigs are commonly applied to mask thinning areas without treating the root cause. Unregulated laser caps and off-label injections are chosen in pursuit of rapid regrowth, despite limited evidence of effectiveness. The methods fail to address thyroid hormone imbalance and result in further damage when used without medical supervision.

How Effective Is Hair Transplant for Treating Hair Loss due to Thyroid?

Hair transplant is an effective permanent solution for treating hair loss due to thyroid disorders once hormone levels are stable and hair shedding has ceased. The procedure transfers healthy hair follicles from dense areas of the scalp to regions affected by thinning or baldness, restoring growth where follicles have been permanently damaged.

Hair transplant methods include Follicular Unit Transplantation (FUT) and Follicular Unit Extraction (FUE). FUE is preferred for its minimal scarring and quicker recovery. Transplanted hair sheds within a few weeks, followed by new growth within three to four months. Full results appear within nine to twelve months.

Turkey is a leading destination for hair transplant procedures, offering experienced surgeons, modern techniques, and lower costs. Clinics provide advanced technologies (robotic FUE systems and sapphire blade implantation). Vera Clinic is one of the top Hair Transplant clinics in Turkey, known for high graft survival rates, natural results, and comprehensive medical tourism packages. The clinic has performed over 40,000 procedures for international patients and is praised for its professionalism and patient support, despite a few concerns noted in recent reviews.

What to Expect Before and After a Hair Transplant due to Thyroid

Expect a medical evaluation and hormone stabilization before a hair transplant due to thyroid imbalance. Surgeons require stable thyroid hormone levels, including thyroid-stimulating hormone (TSH), triiodothyronine (T3), and thyroxine (T4), for several months to proceed safely. Transplant success depends on controlling thyroid function, as unstable levels reduce graft survival and delay healing. Hair loss must be stable before surgery to prevent additional shedding. Lifestyle adjustments (thyroid-supportive diet and stress reduction) improve readiness. Mesenchymal stem cell (MSC) Exosome Therapy is recommended to improve scalp health and prepare the body for surgery.

Expect a gradual healing process after a hair transplant due to thyroid issues. Initial shedding of transplanted hairs is normal, with new growth starting in three to six months and full results developing over 12 to 18 months. Stable thyroid hormone levels are essential for effective healing and hair regrowth. Poorly managed hormones slow recovery and affect hair quality. Post-operative care involves gentle scalp cleaning, avoiding harsh products, and continuing thyroid treatment. Mesenchymal stem cell (MSC) Exosome Therapy supports faster recovery and strengthens new grafts. Consistent hormone management and a low-inflammation lifestyle are critical for long-term success. Results of Hair Transplant Before and After depend heavily on thyroid stability and disciplined care.

When to See a Dermatologist for Hair Loss due to Thyroid

See a dermatologist for hair loss due to thyroid when hair becomes noticeably thin across the entire scalp, with no improvement after hormone treatment. A dermatologist visit is necessary if hair shedding is excessive, strands break easily, or the scalp shows signs of irritation or inflammation. Medical attention is required when hair loss occurs alongside symptoms (unexplained weight changes, constant fatigue, dry skin, brittle hair, or swelling in the neck). Changes in mood, heart rate, or memory function indicate a possible thyroid imbalance affecting hair health. Persistent symptoms for several weeks signal the need for a dermatological evaluation and a possible Hair Transplant Consultation.

How is Thyroid Loss Hair Loss Diagnosed?

Diagnosis of thyroid-related hair loss begins with a detailed medical history and physical examination. A dermatologist evaluates hair density, breakage, and scalp condition. The pull test, tug test, and card test help identify active shedding or shaft abnormalities. Trichometric analysis using Folliscope provides magnified images of hair and scalp for precise assessment.

Blood tests measure thyroid-stimulating hormone (TSH), triiodothyronine (T3), and thyroxine (T4) levels. Elevated TSH indicates hypothyroidism, while low TSH suggests hyperthyroidism. Thyroid antibody tests confirm autoimmune thyroid diseases such as Hashimoto’s or Graves’ disease. Additional tests include ferritin for iron levels and androgens for hormonal imbalances. Scalp biopsy is performed when the cause of hair loss is unclear or when visible inflammation, scarring, or lesions are present on the scalp. Thyroid imaging is required when thyroid nodules, structural abnormalities, or signs of thyroid cancer are suspected based on physical examination or blood test results. Ultrasound detects small lumps in the thyroid, while a thyroid uptake and scan evaluate whether a lump is producing excess thyroid hormone