The pain at the back of the neck when you lower your head is usually considered to be caused by muscle spasm due to poor personal habits in daily life. In addition, if there is a recent history of trauma, may also be caused by soft tissue injury, but also need to consider whether caused by cervical spondylosis, cervical and shoulder myofasciitis and other disease factors, need to clarify the causes of measures to improve: 1, poor posture: cervical spine has a forward physiological bending, incorrect posture is easy to make the neck muscles, fascia, ligaments and other spasms, head down activities will pull the spastic soft tissue, causing the back of the neck The pain is obvious. At the same time, if the same posture is maintained for a long time, lactic acid will accumulate in the muscles, which will also cause pain when the nutrient metabolism in the muscle is impaired; 2, cold neck: if the back of the neck is stimulated by cold, it will lead to muscle spasm and obstruct blood circulation, which can produce pain when lowering the head; 3, soft tissue injury: including strains and sprains, which can lead to obvious soft tissue injury at the back of the neck and pain at the back of the neck when lowering the head. 4, cervical spondylosis: cervical spine osteophytes or cervical disc herniation can lead to cervical spondylosis, accompanied by neck and back pain, stiffness, numbness, weakness and inflexibility of the limbs, dizziness, nausea, vomiting and other symptoms; 5, neck and shoulder myofasciitis: the fascia of the neck is repeatedly stretched, which can cause edema in the fascia of the back of the neck, forming a sterile inflammation in the local area, manifesting as obvious soreness and pain in the back of the neck, especially when the head is lowered The pain will be aggravated when moving around.