The causes of itching after sweating include physiological and pathological, pathological causes such as cholinergic urticaria, and treatment includes medication such as antihistamines. 1. Physiological causes: after a lot of sweating, if not washed in time, the skin surface of the sweat, bacteria and other breeding can cause itching. It is necessary to develop good hygiene habits and keep personal hygiene. 2. Pathological causes: cholinergic urticaria can lead to itchy skin after exercise and heat, acetylcholine is released during exercise, which causes itchy skin, and exercise is usually accompanied by sweating under the state of heat, so itchy skin after sweating can occur. Antihistamines such as cetirizine and ebastine can be used for treatment, and danazol and ketotifen can be used in combination, which should be selected under the guidance of the doctor. When patients experience discomfort, they should go to the hospital immediately.