The most common cause of palmar itching is usually considered to be limited itching of the skin, which may be related to psycho-psychological factors, irritating diets, skin intolerance, etc. It is more common in the palm because the skin on the palm is more sensitive than other parts of the body; in addition, palmar itching may also be itching with skin lesions, which may be caused by infectious skin diseases, allergic skin diseases and palmar manifestations of systemic diseases.