Pain in the left shoulder and cervical spine usually has three causes: 1, because the left shoulder and cervical spine area of the muscles, tendons, and ligaments and other soft tissues due to excessive force strain, the formation of local bruising and inflammatory metabolites accumulation, will lead to peripheral nerve stimulation and pain, especially in the activity of the foci further strain, the pain is more obvious. 2, due to the left shoulder and cervical spine area of soft tissue strain, that is, soft tissue over fatigue formed injury, usually in the activity of the symptoms are not obvious, but after rest will lead to pain is more obvious. The symptoms are usually not very obvious when moving, but after resting, the pain is more obvious, especially when it is accompanied by cold, leading to further aggravation of the symptoms. 3. The skin of the left shoulder joint and cervical spine is exposed during sleep at night, and the condition of cold occurs. This leads to the accumulation of local metabolic products, such as inflammation and lactic acid, which stimulate the peripheral nerves and cause local pain symptoms.