The main causes of arm muscle pain include physiological causes and pathological causes. 1. Physiological reasons: mainly due to muscle fatigue injury, commonly found in heavy laborers or long time inactivity, sudden and sharp force of the crowd. Long-term muscle fatigue will result in anaerobic muscle metabolism, causing accumulation of lactic acid, oxygen free radicals and other metabolites, which will stimulate the nerve roots and give rise to symptoms of muscle pain. 2. Pathologic causes: common in patients with cervical spondylosis, especially sympathetic cervical spondylosis. Due to the cervical spondylosis patients have degenerative lesions in the cervical intervertebral discs and the formation of bone redundancy, the intervertebral discs stimulate the nerve roots or spinal nerves in the vertebral canal, and the innervated area will have symptoms of pain and numbness. Working can cause the nerve irritation to worsen and the symptoms to become more prominent. A work arm muscle pain may also have other causes, it is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.