If a patient has arm pain while swimming, the cause is due to excessive activity or low water temperature, resulting in damage to the soft tissues of the arm, which is a kind of sterile inflammation. In terms of specific relief methods, first of all, the patient should stop exercising and avoid getting cold. The affected limb can be elevated, and Chinese medicine massage can be given to the affected limb, or ointment to activate blood circulation and remove blood stasis can be applied externally, and physical therapy such as acupuncture point herbal iontophoresis or acupuncture and moxibustion can be performed to promote local blood circulation. In addition, if the patient’s blood pressure is not high and there is no history of cerebral hemorrhage, he can also take oral medications to activate blood circulation and remove blood stasis. In conclusion, after this phenomenon occurs, the patient must avoid such unfavorable factors as exertion, strain, and cold, and should be effectively disposed of under the guidance of a doctor in order to have the symptoms of arm pain relieved as soon as possible.