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How Thyroid Disorders Cause Hair Loss

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Hypothyroidism and Hair Loss: Hypothyroidism, characterized by an underactive thyroid gland producing insufficient thyroid hormones, can cause hair follicles to remain in the resting phase of their growth cycle. This leads to hair thinning, weakened hair, and eventually, hair loss. The lack of hormone production slows down the metabolism, affecting the hair growth cycle and leading to noticeable thinning and loss over time.


Hyperthyroidism and Hair Loss: Conversely, hyperthyroidism—where the thyroid gland is overactive and produces too much thyroid hormone—can also lead to hair loss. The excess hormones can accelerate the hair growth cycle, pushing hair into the shedding phase sooner than it should. This can result in thinning hair across the scalp and other areas of the body.

Signs and Symptoms

Besides hair loss, thyroid disorders can manifest a range of symptoms, including changes in weight, mood swings, altered energy levels, and temperature sensitivity. Hair loss related to thyroid issues typically presents as a uniform thinning across the entire scalp, rather than patchy or focal loss seen in other conditions like alopecia areata.

Diagnosis and Treatment

Diagnosing hair loss due to thyroid disorders involves a comprehensive approach, including a physical examination, a review of symptoms, and specific blood tests to measure the levels of thyroid hormones and thyroid-stimulating hormone (TSH). Once a thyroid disorder is confirmed, treatment typically involves medication to normalize thyroid hormone levels.

  • For hypothyroidism, synthetic thyroid hormone replacement therapy (levothyroxine) is commonly prescribed to supplement low hormone levels.
  • In the case of hyperthyroidism, treatment options may include medication to reduce thyroid hormone production, radioactive iodine therapy, or surgery, depending on the severity and underlying cause.
Managing Hair Loss

In addition to treating the underlying thyroid disorder, managing hair loss may involve specific hair care strategies and treatments to encourage hair growth and reduce further loss. Nutritional support, stress management, and avoiding harsh hair treatments can also be beneficial.


The intricate relationship between the thyroid gland and hair growth underscores the importance of a well-functioning thyroid for maintaining healthy hair. If you’re experiencing hair loss, it’s crucial to consider the thyroid as a potential factor. Early diagnosis and treatment of thyroid disorders can not only help manage hair loss but also improve overall health and well-being. If you suspect your hair loss may be related to your thyroid, consult with a healthcare provider to explore diagnostic and treatment options tailored to your needs.

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