The causes of pain in the back of the neck include neck muscle strain, neck diseases and other causes. 1. Neck muscle strain: Keeping a position for a long time to look at the computer or cell phone, or sleeping with the cervical spine cold, etc., may cause stiffness and pain in the back of the neck muscles. 2. Cervical spondylosis: it is categorized into limited cervical spondylosis, spinal cord cervical spondylosis, nerve root cervical spondylosis, vertebral artery cervical spondylosis, mixed cervical spondylosis and sympathetic cervical spondylosis, and no matter which type it is, it may cause neck pain. 3. Cervical disc herniation: Neck stiffness like falling pillow, or even cut-like pain, the general symptoms are persistent, and in severe cases, the pain is intolerable and cannot sleep at night. In severe cases, the pain is intolerable and cannot sleep at night. When the disc herniation ruptures, the pain may radiate to the occipital area. 4. Cervical spinal stenosis: when the nerve root in the neck is compressed, the first manifestation of pain in the area where the nerve root is distributed, such as pain in the back of the neck, sometimes like a discharge-like sensation. In addition to the above causes, muscle strain at the back of the neck and cervical spine instability can also cause the above symptoms. If the symptoms persist, it is recommended to go to the hospital in time, complete the examination to clarify the cause of the disease, and then give targeted treatment.