Itchy body after running is usually a symptom of acne, lichen planus, urticaria or cholinergic urticaria. 1. Acne is caused by the accumulation of sebum at the mouth of hair follicles, which breeds bacteria, and occurs on the face and chest and back. It may cause body itching due to increased secretion of sweat glands during running. 2. Tinea versicolor is caused by fungal infection, transmitted through skin contact. After running, due to the heat of the body, the fungal activity will be exuberant and itchy to varying degrees. 3. Urticaria is caused by allergy, and the body’s immune system disorders related to the onset of intense itching. Running is easy to stimulate urticaria due to body heat and wind. 4. Cholinergic urticaria is a type of urticaria whose cause is unknown and is related to immune system disorders and androgen metabolism abnormalities, and there are more male than female patients. Cholinergic urticaria often occurs after eating spicy foods, temperature changes, exercise, and emotional stress. Itching after running can be due to a variety of reasons, the symptoms continue to be unrelieved should be timely consultation, follow the doctor’s instructions for treatment.