There are many reasons for the soreness at the junction of shoulder and neck, and the common reasons are muscle strain, falling pillow, shoulder and neck fasciitis, cervical spondylosis and so on. 1. Muscle strain: keeping the head down for a long time or bad posture, resulting in muscle pulling state, or prolonged weight-bearing work to make shoulder and neck muscle strain, and then the symptoms of soreness. 2. pillow fall: sleeping pillow is too high or bad posture, coupled with cold and other factors, resulting in neck pillow fall, so that the junction of shoulder and neck pain, and activities are limited. 3. Shoulder and neck fasciitis: due to long hours of computer, desk work, looking down at the cell phone and other shoulder and neck muscles are in a state of tension, in the case of cold or lack of exercise, easy to trigger fasciitis, so that the shoulder and neck pain symptoms. 4. Cervical spondylosis: patients with cervical spondylosis often have the symptom of spinal nerve compression, and the shoulder and neck areas that are innervated by the compressed nerves will have symptoms such as soreness and numbness. There are other reasons for shoulder and neck junction pain, it is recommended to go to the hospital in time to identify the cause and give targeted treatment.