One of the most distressing symptoms for patients diagnosed with thyroid disorders is sudden and severe hair loss. You might notice large clumps of hair in your brush or thinning across your entire scalp.

Why Does It Happen?

Your hair follicles follow a cycle of growth, resting, and shedding. Both Hypothyroidism (underactive) and Hyperthyroidism (overactive) shock your system, pushing a large percentage of your hair follicles into the "resting" phase all at once. This results in diffuse hair thinning.

The Good News: It is Reversible

Unlike genetic male-pattern baldness, thyroid-induced hair loss is usually temporary. Once your thyroid hormone levels (TSH, T3, T4) are stabilized with the correct medication dosage, your hair will return to its normal growth cycle.

What Should You Do?

Patience is essential. Hair grows slowly, and it may take 4 to 6 months after your thyroid levels normalize before you see significant regrowth. In the meantime, ensure you are not deficient in Iron, Vitamin B12, or Vitamin D, as these also contribute heavily to hair health.