Arm pain is caused by the following reasons: 1, the most common factor is orthopedic surgery factors, such as too much exercise or exercise too hard resulting in muscle strain, or the emergence of spondylitis, cervical spondylosis, shoulder joint function injury, etc. will lead to arm pain. 2, the day before the exercise of too much start the anaerobic glycolysis pathway, the release of a large number of ATP at the same time the body will be a large amount of lactic acid. When too much lactic acid is accumulated in the body, arm soreness and swelling will occur.3, incorrect exercise methods and methods lead to rhabdomyolysis, arm soreness will also occur.4, heat spasms, heat exhaustion and pyrexia, arm soreness and swelling will also occur.5, acute cerebrovascular disease, such as cerebral hemorrhage, cerebral infarction, cerebral vascular stroke, arm soreness will occur.6, acute cerebral vascular diseases, such as cerebral hemorrhage, cerebral infarction, cerebral vascular stroke, cerebral vascular disease will occur.