Small arm pain may be caused by excessive accumulation of lactic acid in the local muscles, may also be a manifestation of chronic strain injury, you can carry out local massage, take medication and physical therapy and other methods to alleviate the symptoms of discomfort. 1. local massage: the small arm massage, not only can promote local blood circulation, but also can make the accumulation of lactic acid within the muscle absorption dissipation, to a certain extent to reduce pain. 2. Taking medication: If your arm continues to ache, it is recommended that you take ibuprofen or diclofenac sodium as prescribed by your doctor for pain relief. 3. Physical therapy: infrared radiation, grilled electricity and other physical therapy, can reduce local muscle tissue congestion and promote blood circulation, most will have a better effect. In addition to the above common causes of arm pain, it may also be related to some diseases, so unexplained arm pain, or after the above treatment does not relieve, it is recommended to consult a doctor in a timely manner, to clarify the cause of the disease.