Itchy feeling after exercise is likely to be the manifestation of cholinergic urticaria, may also be caused by sweat stimulation, need to be specifically analyzed. 1. Cholinergic urticaria: the cause of this disease is due to the body after exercise to release a large number of acetylcholine, acetylcholine in the mast cells leading to the emergence of skin erythema, doughnuts with the symptoms of itching. 2. Sweat stimulation: the whole body’s metabolism speeds up during exercise, the body’s sweat to accelerate the discharge of sweat, sweat stimulation of the skin may cause itchy skin. Itchy body after exercise may also exist for other reasons, it is recommended that in the itching symptoms continue to be unrelieved to the hospital, a clear cause of the symptomatic treatment.