The pain in the tendon when you exert your arm can be seen in lactic acid accumulation, tendon injury and cervical spondylosis compression of the nerve, etc. It is recommended to take physical and medication treatments after further examination, and surgery is needed for serious cases. 1. If the pain is caused by the accumulation of lactic acid after a long period of inactivity, there is no need for special treatment, attention to rest, and local massage can relieve the pain. 2. If it is due to improper exertion caused by muscle injury, tendon injury, etc., you need to pay attention to rest, to avoid secondary damage, if necessary, can be triangular towel external fixation, for the degree of injury can be used externally flurbiprofen Babu Cream and oral celecoxib, ibuprofen and other anti-inflammatory drugs, surgical incision for internal fixation and other treatments, if necessary. 3. If the injury is caused by nerve compression due to cervical spondylosis, it is recommended to carry out physiotherapy, hot compresses, grilling, traction and other treatments, and if necessary, surgical removal of intervertebral discs and other treatments. Therefore, it is recommended to go to the hospital for further examination to clarify the diagnosis and carry out appropriate treatment under the doctor’s advice.