Swelling of the arm after being smashed may be caused by soft tissue injury, or it may be caused by fracture, and the solutions include physical therapy, medication and surgery. 1. Soft tissue injury: arm smashed injury will cause soft tissue congestion, edema. It is recommended that the patient be treated with braking, ice compresses and triangular towel suspension to prevent further aggravation of the injury. 72 hours later, the affected limb can be treated with hot compresses and deep microwave to promote blood circulation. Patients with significant pain can take oral ibuprofen, indomethacin and other drugs as appropriate to relieve pain. 2. Fracture: An arm injury may result in a fracture causing localized swelling. In the case of a clear fracture on imaging, if the fracture line is well aligned or in the case of a minor avulsion fracture, external fixation with a brace or plaster may be an option; if the fracture is comminuted or passes through the articular surface, surgical fixation is mostly recommended. The same symptom, different causes, different stages of the disease, different treatment methods, should be standardized under the guidance of the doctor. The above medications should be used under the guidance of a doctor, avoiding self-medication.