The left side of the neck with clavicle pain may be due to local muscle strain, cervical spondylosis, lymphadenitis and other causes. 1. Muscle strain: patients keep a posture for a long time or cervical vertebrae area for a long time to repeat a movement, resulting in local muscle damage, muscle spasm, when the involvement of the surrounding tissues, the left side of the neck with the clavicle pain symptoms. 2. Cervical spondylosis: when suffering from cervical spondylosis, the spine will appear degenerative changes or abnormal hyperplasia, if the compression or stimulation of local nerves, blood vessels, resulting in the left side of the neck with clavicle pain symptoms. 3. Lymphadenitis: when the local lymph nodes are infected by viruses and bacteria leading to benign lesions, so that the lymphatic enlargement and pain phenomenon, amblyopia symptoms are more serious cases, the involvement of the surrounding lymph nodes, which can be manifested in the left side of the neck with the symptoms of clavicle pain. When the discomfort symptoms, it is recommended to go to the hospital for examination and diagnosis in time, and give regular treatment after clarifying the cause of the disease.