The more common reason for the pain and discomfort in the arm area after playing ball is that the exercise is too long, or the exercise is too intense, and the local muscle damage is painful, or the lactic acid buildup is painful. Of course, there is no exception to the localization of the place itself has lesions, because of exercise-induced pain. Pay attention to the appearance of the local area, there is no obvious swelling and lumps. If there is no obvious abnormality in the appearance, you can apply warm compresses to the local area. In addition, you can apply creams, such as etofenamate gel, you can also choose flurbiprofen babu cream and other treatments. Take rest and avoid exertion on the arm for the time being. If it is caused by lactic acid accumulation or strain, it can be significantly improved after treatment and rest for 3-5 days. If the localized pain is obvious, or accompanied by abnormal masses, it is necessary to go to the orthopedic department for examination. Localized areas need to be photographed, if necessary, magnetic resonance imaging, to help clarify the condition.