Pain in the back of the neck may be caused by pillow fall, trauma, cervical fasciitis, cervical spine disease and other reasons. 1. Pillow fall: If the pillow is too high or the sleeping posture is incorrect, it may cause pillow fall, which may lead to pain in the back of the neck, usually no special treatment, timely replacement of comfortable pillows, adjust the sleeping posture can be. 2. Trauma: If the neck is accidentally injured during normal exercise and work, it may produce local redness and swelling, thus causing pain, usually without special treatment, if the pain is unbearable and long time without relief, it is recommended to go to the regular hospital for diagnosis and treatment in time. 3. Cervical fasciitis: due to work and study reasons such as long-term head down, long-term neck muscles to maintain a special posture, may produce muscle spasm and cause vascular insufficient blood supply, resulting in aseptic inflammation, thus causing neck pain. 4. Cervical spine disease: If you suffer from herniated disc or cervical spine osteophytes and other diseases, the cervical spine nerves, muscles or ligaments and other tissues may be compressed, resulting in neck pain and other conditions. If the symptoms persist, you should go to the hospital in time, and standardize the treatment under the guidance of the doctor.