The itchy upper half of the back can be caused by physiological factors such as a dry environment and frequent bathing, or it can be caused by pathological factors such as eczema, urticaria and neurodermatitis. 1. Physiological factors: dry environment, bathing too often, etc., will lead to a decline in the body’s skin barrier function, resulting in back skin dehydration, making the back itchy. 2. Eczema: acute eczema that occurs on the upper back, the lesions are often fused into patches, spreading to the surrounding area, usually with intense itching and burning sensation, intensified at night. Chronic eczema that occurs early in the upper back, will make part of the skin thickening, mossy changes, itching degree of severity varies. 3. Urticaria: Urticaria on the upper back, often manifested in different sizes and shapes of the wind, and accompanied by itching. Serious fever, nausea, vomiting, abdominal pain and other systemic symptoms. 4. Neurodermatitis: closely related to nervousness and anxiety and other psychoneurological factors, can also appear in the upper part of the back. Typical lesions are flat papules of varying sizes and shapes, accompanied by a burst of intense itching. There may be other reasons for the itchy upper back, it is recommended to go to the regular hospital in time, clear diagnosis, follow the doctor’s instructions standardized treatment.