The swelling of the arm after a fall is due to the following reasons: 1. Consider that the local swelling is caused by a fracture. After the fracture of the arm, the local blood vessels rupture, causing blood leakage and swelling. 2. Consider that after the fall of the arm, the local muscles and soft tissues are strained and strained, causing swelling and pain. The swelling of the arm should be promptly seen in the emergency surgery or orthopedics department of the hospital, and an X-ray of the arm should be taken to clarify whether there is a fracture. If there is a fracture, surgery or external fixation will be required. If there is no fracture and the injury is simply a strain or strain on the soft tissues of the muscles, you can apply blood circulation and blood stasis medication to reduce swelling, and choose topical treatment such as Fotarine. After a fall, you need to pay attention to the arm to avoid exceeding the best treatment time and causing deformity healing.