Pain is caused by raising the left arm, which is usually seen in the following cases: 1, the most common clinical cervical spondylosis, cervical disc herniation nerve compression caused by one side of the upper limb neuralgia, the general pain is presented as radioactive pain or discharge-like pain, and sometimes combined with numbness, mainly because the nerve root compression after the muscle pain, nerve pain in the innervation area. There is a special clinical test called brachial plexus nerve pull test, that is, when the upper limb is abducted and pulled outward with force, and the cervical spine is moved in the opposite direction, it will induce severe pain in the upper limb, then it can be determined that the pain is caused by nerve root compression. 2, after strenuous exercise, such as playing badminton, basketball and other activities, there is muscle strain and inflammation of the fascia in the upper limb. Therefore, when the arm is raised, it will cause muscle pain. The second condition is relatively easy to treat, generally oral medication, after sufficient rest, the symptoms can be significantly relieved.