When there are symptoms of hair loss and sweating on the top of the head, if the amount of hair loss per day does not exceed 100, sweating on the top of the head may be caused by physiological reasons, such as hot weather, etc.; if the amount of hair loss per day exceeds 100, there are also symptoms of excessive sweating, which may be caused by pathological reasons, such as hyperthyroidism, androgenetic alopecia, etc.. 1. Physiological reasons: people will lose hair every day, and the amount of hair loss per day usually does not exceed 100, which is a physiological phenomenon. If the weather is hot, it will cause excessive secretion of sweat on the top of the head, accompanied by the phenomenon of physiological hair loss. This situation usually does not require treatment, keep the local cool, dry can. 2. Pathologic causes: (1) hyperthyroidism: due to the patient’s hyperthyroidism, resulting in a significant increase in the body’s secretion of thyroid hormones, resulting in an increase in the body’s basal metabolic rate, increased nerve excitability, may cause excessive sweating on the top of the head, and at the same time, rapid metabolism can cause hair thinning, thinning, etc., but also can cause alopecia and so on. (2) Androgenetic alopecia: the cause of this disease is unknown, may be related to excessive secretion of androgens, genetic factors, etc., can lead to hair follicle miniaturization or even disappearance, resulting in hair loss, in addition, if the patient eats spicy and stimulating food or when the weather is hot, there may also be excessive sweating symptoms. Sweating on the top of the head and hair loss may also be caused by other diseases, it is recommended that patients seek medical attention as soon as possible, after a clear diagnosis, under the guidance of the doctor to give targeted treatment.