Head sweaty hair wet considerations are hot weather or strenuous exercise and other physiological factors, may also be hyperhidrosis, hyperthyroidism and other diseases. 1. Physiological factors: If the weather temperature is too high, or just experienced strenuous exercise, will lead to sweat all over the body, part of the head sweating seriously, there will be wet hair. 2. Hyperhidrosis: Hyperhidrosis is an abnormal increase in local or generalized skin sweating, the causes of which include heredity, diseases and medications, which can cause sweaty hair on the head. 3. Hyperthyroidism: Sweaty hair on the head can also be caused by hyperthyroidism. The patient will appear body metabolism hyper, system excitability increased performance, typical symptoms are sweating, lose weight, hand tremor, and so on. There are many reasons for sweaty hair on the head, so it is recommended to consult a doctor for a clear diagnosis.