Does thyroid cause hair loss and how is it treated?

Hair loss is one of the most bothersome thyroid disorder symptoms — occurring in both hypothyroidism and hyperthyroidism.

How Thyroid Causes Hair Loss:

• Hypothyroidism: Slows hair growth cycle — more hair enters shedding phase (Telogen). Diffuse and gradual, not patchy.
• Hyperthyroidism: Accelerates hair cycle — thin, brittle hair that falls easily.
• Hashimoto's/Graves': Autoimmunity may attack hair follicles too — causing patchy baldness (Alopecia Areata).

Classic Sign:

Loss of the outer third of eyebrows — a classic sign of hypothyroidism.

Treatment:

• Stabilize thyroid hormones first: Most hair regrows 6-12 months after hormone stabilization.
• Check iron and vitamin D: Their deficiency is common with hypothyroidism and worsens hair loss.
• Biotin: Supplement supporting hair growth — 5000 mcg daily.
• Patience: Hair cycle is 3-6 months — results don't appear immediately.

At BEIT TARIQ Center, we test thyroid, iron, and vitamins together to accurately determine the cause of hair loss.