Sore hands may be caused by excessive exercise, delayed ulnar neuritis, dermatomyositis and so on. 1. Excessive exercise: if the hand is overly exercised or kept in a position for a long time without rest, causing lactic acid accumulation, muscle spasm, muscle fiber damage, etc., it will lead to the symptoms of hand soreness. 2. Delayed ulnar neuritis: delayed ulnar neuritis can cause ulnar nerve palsy symptoms, which will lead to the symptoms of numbness, pain and soreness on the ulnar side of the hand. 3. Dermatomyositis: It is a group of autoimmune diseases mainly involving the skin and muscles, usually including both skin and muscle lesions, often manifested as symmetrical fleshy muscle weakness, soreness, pain and tenderness. It may cause patients to have sore hands. Sore hands may also be caused by other reasons, it is recommended that patients seek medical attention in time to clarify the cause of the disease, and then follow the doctor’s instructions for standardized treatment and therapy.