Swollen and itchy hands may be poor or damaged peripheral circulation, contact dermatitis, eczema and so on. 1. Poor or damaged peripheral circulation: hands belong to the peripheral tissues, hands with rich blood vessels and peripheral nerves, when the patient suffers from certain diseases that can affect the peripheral nerve vessels and nerve endings, there may be a sudden swelling of the hands and itchy symptoms, and some diabetic patients in the late stage of the disease will also appear hand swelling and itching. 2. Contact dermatitis: the patient’s hands in contact with certain allergenic substances or chemicals may lead to hand skin allergies, hand swelling and itching, there may also be a generalized rash of the wind, to do anti-allergy treatment in a timely manner. 3. Eczema: allergies, certain chronic diseases or genetic factors related to the acute phase can appear hand swelling, oozing, itching performance. If the symptoms of swollen and itchy hands appear, it is recommended to go to the hospital in time for early and regular treatment.