If the left side of the neck is uncomfortable, the following reasons are common: First, keeping a fixed position for a long time to work or study: it is easy to make the left side of the neck muscles are continuously pulled, which leads to pain symptoms. Patients may have limited cervical spine activity, pressing the neck muscles will have obvious pain, correct bad posture, appropriate hot compresses, can make the symptoms quickly relieve. Second, cervical spine joint disorder: the cervical spine joints lose the normal relationship between the small joints, the left side of the neck muscles will have reflex spasm, tension, manifested as local pain symptoms, accompanied by neck stiffness, through the X-ray examination, can be confirmed by the cervical spine joint disorder. Through early diagnosis and early treatment, the clinical symptoms of left side neck discomfort can be relieved quickly to avoid aggravation of the condition and to prevent affecting normal life, work, and sports, and the patient should strengthen the exercise of the neck muscles in general to protect the cervical spine.