Excessive sweating in the fall can be related to high ambient temperatures, to vitamin D deficiency and calcium deficiency, and even to hyperthyroidism, diabetes, and tuberculosis. 1. Environmental temperature. In the fall, the temperature is higher, the skin in order to adapt to the ambient temperature, it will reduce the body surface temperature by sweating, so it will be manifested as excessive sweating. 2. Vitamin D deficiency and calcium deficiency can also cause increased sweating, which is mostly seen in some children or teenagers. 3. Endocrine system diseases such as hyperthyroidism and diabetes affect the level of hormone secretion in the body, thus affecting the secretion of sweat. Tuberculosis, as a chronic wasting disease, can also be characterized by hot flashes (bouts of fever) and excessive sweating. For excessive sweating that is not relieved by changing the ambient temperature, it is important to go to the hospital in time.