Chronic strain injury is an injury caused by various over-limited activities that exceed the maximum normal physiological range of activity or the local tolerable hourly value. Common chronic strain injury factors are as follows. Poor sleep posture is mainly the pillow is too high. In the sleep state, a long period of poor posture makes the internal force of the intervertebral disc uneven, affecting the role of the culprit. Second, the neck muscles and joints are also therefore out of balance, accelerating degeneration. Daily life habits for a long time to play mahjong, poker, watching TV for a long time, especially lying in bed with a high pillow are bad habits. The common feature of the above habits is that the cervical spine is in a state of flexion for a long time, and the muscles and ligamentous tissues behind the neck are overloaded, which can easily cause strain injury. Poor work posture involving computers, microscopes, carving, embroidery and other staff also need to work for a long time with their heads down. In the flexed neck state, the intervertebral disc pressure is much higher than the normal position. This position is easy to accelerate the degeneration of the cervical disc and strain on the soft tissues of the neck.