Left arm pain caused by cervical spondylosis needs to be treated with general treatment, physical therapy, medication and surgery according to the specific severity. 1. General treatment: In daily life, try to avoid maintaining a fixed posture for a long time and avoid working for a long time with the head down, which will easily aggravate the uncomfortable symptoms of cervical spondylosis. 2. Physical therapy and medication: If the pain is only occasional, physical therapy can be used, including continuous cervical traction therapy, acupressure, massage, acupuncture and physiotherapy, and with oral medication such as celecoxib capsule, rosoprofen sodium and methylcobalamin. 3. Surgery: If the arm pain is more serious and the symptoms recur, surgery should be considered. Surgery to remove the protruding intervertebral discs and enlarge the narrowed intervertebral foramina can relieve the nerve compression and alleviate the clinical symptoms of radiating pain in the arm. Left arm pain caused by cervical spondylosis needs to be treated systematically under the guidance of a doctor, do not blindly use drugs.