There are many causes of right small arm pain, mainly the following: 1, humeral epicondylitis, also known as tennis elbow, mostly caused by overuse of forearm muscles; 2, small arm muscle overwork and excessive local lactic acid accumulation causes pain; 3, local muscle strain; 4, frozen shoulder, cervical spondylosis, cervical disc herniation compression nerve caused by forearm pain; 5, wind, cold and rheumatism caused by pain; 6, bone cancer , muscle necrosis and local vascular lesions. Patients should reduce arm activities and local massage, hot compresses to increase blood circulation, improve local muscle tissue ischemia and hypoxia, reduce muscle fiber fatigue caused by muscle overstretching, and also apply blood circulation and pain relieving drugs to relieve pain, and need to treat the original disease if there is one.