Small arm pain is considered to be related to physiological causes such as overwork, and pathologic causes such as trauma, frozen shoulder and cervical spondylosis. 1. Physiological reasons: Strenuous exercise, improper posture and other physiological reasons, causing lactic acid accumulation or spasm in the forearm muscles, which can cause pain in the small arm. 2. Trauma: small arm pain can occur due to trauma and other violent factors, resulting in damage to the bone and soft tissue of the small arm. 3. Local inflammation: small arm pain can occur due to aseptic inflammation of local bone, fascia, muscle and other tissues caused by long-term small arm strain, such as epicondylitis of humerus and local fasciitis. 4. Cervical spondylosis: due to cervical herniated intervertebral disc compressing the innervated arm nerves, especially when the lower cervical intervertebral disc is herniated, the pain in the small arm can occur. Small arm pain may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.