Hidden pain in the upper part of the neck in the lower part of the right back of the head may be caused by physiological factors such as pillow fall, fatigue, and other physiological factors, but also may be caused by trauma, cervical spondylosis and other pathological factors. 1. Physiological factors: if there is a pillow, or heavy physical labor, will lead to muscle spasm around the neck, strain, causing pain in the upper neck, in addition, if you play the phone for a long time with your head down, the local muscles to maintain tension for a long time, will also cause local pain. 2. Trauma: If the neck muscle suffers a violent impact, there can be soft tissue damage, there will be pain symptoms, usually accompanied by local redness, swelling or subcutaneous bruising. 3. Cervical spondylosis: such as cervical spine osteophytes or herniated discs, can make the cervical spinal cord, nerve roots, vertebral artery, etc. compression, the more common is the nerve root cervical spondylosis, neck pain, stiffness, with the development of the disease, there will be upper extremity radiating pain or numbness, and so on. Hidden pain in the upper part of the neck at the lower part of the right back of the head may be caused by other reasons, you should consult a doctor in time to find out the cause of the disease for treatment. Pay more attention to rest, avoid keeping a position for a long time.