Understanding Thyroid Problems: 15 Warning Signs

7. Hair loss

Both hypothyroidism and hyperthyroidism can adversely affect hair quality and growth. When the thyroid produces too little hormone, hair follicles enter resting mode, which leads to hair loss and dry, brittle strands. This hair loss is not restricted to the scalp alone but also occurs on the limbs, underarms, and even eyebrows. Hyperthyroidism tends to affect only the scalp. Hair loss there is often more severe and noticeable than that caused by hypothyroidism. Fortunately, it is possible to restore full hair growth with appropriate treatment.