If the arm has cramp-like pain, it is caused by muscle and fascia strain injury in the arm area, which in turn causes muscle and fascia spasm and edema in the arm area, resulting in cramp-like pain. In patients with frozen shoulder, the ligaments and joint capsule around the shoulder joint will adhere and contract, and the starting point of the muscles in the arm area is around the shoulder joint, so adhesions will also occur, resulting in cramp-like pain in the arm when lifting the shoulder. In patients with neurogenic cervical spondylosis, acute compression of the nerve root will cause nerve root spasm and weakened conduction, resulting in pain like arm cramps and, in severe cases, pain in the hand.