Cervical spondylosis is mainly caused by neck trauma, strain injury, degenerative lesions and other factors, and the main symptoms are head, neck, shoulder, back, arm pain, stiff neck, limited movement, and even quadriplegia and paralysis. Patients with cervical spondylosis can easily overstretch the muscles of the back of the neck due to prolonged head down or maintaining a posture for labor, thus experiencing obvious pain symptoms in the back of the neck. At the same time, it can also lead to the pressure change of cervical curvature, which can compress the nerve root of the back of the neck, causing nerve root spasm, and there are obvious symptoms of soreness, numbness, distension and pain in the back of the neck, therefore, cervical spondylosis can cause left back pain. Patients with cervical spondylosis should adopt the correct sleeping posture in daily life; correct bad posture to reduce strain; strengthen the exercise of neck and shoulder muscles; pay attention to keep the neck and shoulder warm; avoid and reduce acute injuries, such as avoiding lifting heavy objects and so on. If the symptoms of left back pain are not relieved, or accompanied by other symptoms, you should go to the hospital in a timely manner, to identify the cause and then give targeted treatment.