Swelling of the arm can be relieved by local braking, cold compresses, resetting and fixing the fracture, and ultrasound examination, as follows: First, local braking, cold compresses, etc.: If the swelling is caused by soft tissue injury, short-term local braking should be applied, together with continuous cold compress treatment, and the affected limb should be elevated to promote the swelling to subside as soon as possible. Second, reset and fix the fracture: If the local swelling is caused by upper limb fracture, the fracture should be reset and fixed, and the swelling symptoms will be gradually relieved after the fracture is stabilized. Third, color ultrasound examination: If the swelling is caused by vascular lesions in the upper limbs, color ultrasound examination should be performed to restore blood supply to the blood vessels and improve blood supply to muscles and other tissues in a timely manner, which can prompt the swelling to subside quickly. If upper limb swelling occurs, early diagnosis and early treatment should be made, and corresponding treatment methods should be selected according to different etiologies, which can make upper limb swelling symptoms be relieved rapidly and avoid serious diseases, such as upper limb thrombosis, upper limb ischemia, necrosis and consequences such as delayed healing of fracture and malformation healing.