Small arm pain is not always the cause of disease, need to consider physiological causes, pathological causes, such as muscle strain, cervical spondylosis, humeral epicondylitis. 1. Physiological reasons: for example, the small arm for a long time in a fixed position or sleep at night when the local pressure caused by small arm pain, appropriate activities can be relieved. 2. Muscle strain: If you carry heavy objects or work in a position for a long time, it can cause muscle pain in the lower arm, which can be relieved by massage and external use of blood-boosting and pain-relieving medicines such as safflower oil. 3. Cervical spondylosis: cervical spondylotic hyperplasia or herniated discs can radiate to the small arm pain, some will have numbness, through the cervical spine traction, acupuncture and most of the treatment can be reduced. 4. Epicondylitis of the humerus: mainly for the lateral elbow joint pain, pulling the outer side of the small arm pain, if wringing towels or sweeping the floor pain is obvious. If the pain in the lower arm is not alleviated by rest, it is recommended to go to the orthopedic department or rehabilitation department of the hospital.