The common clinical causes of left arm soreness are mainly the following First, patients do not have local muscle relaxation after upper limb exercise, which can cause a large amount of lactic acid and metabolic waste deposited in the left arm, and cause soreness symptoms. At this time, patients can reduce the discomfort of soreness in the left arm by local massage, physiotherapy, adequate rest, and external application of hot aman pack to reduce the absorption of lactic acid and metabolic wastes. Second, patients with cervical spondylosis can cause radioactive pain and discomfort in the left arm due to nerve compression by cervical disc herniation, which can be relieved by massage and physiotherapy in the neck. For patients with serious conditions, cervical spine magnetic resonance examination is feasible, and if necessary, surgery can be performed to release the nerve compression so as to relieve the symptoms of arm pain.