Itchy upper body may be caused by physiological factors such as poor hygiene habits, or it may be caused by diseases such as eczema and ringworm. 1. Physiological factors: poor hygiene habits or poor living environment may lead to dirt adhering to the body, thus triggering the upper body itch. 2. Eczema: Eczema is usually characterized by itching, erythema, papules, blisters and other symptoms, and the rash can be distributed all over the body surface. The cause of eczema is complex, and may be related to genetic, immune, endocrine and mental factors. 3. Ringworm: the cause of ringworm is mostly related to red trichophyton, canine microsporidium and other dermatophyte infections, patients will appear red papules, papules and scales and other symptoms, accompanied by itching, commonly found on the trunk, arms and other places. There are many causes of itchy upper body, after excluding physiological factors, it is recommended that patients seek medical examination to clarify the cause of the disease.