Physiological curvature means that the human spine has a normal curvature, such as the cervical and lumbar spine protruding forward and the thoracic and sacral spine protruding backward. Trauma and cervical spine disease, lumbar disc herniation, ankylosing spondylitis, muscle strain and other diseases can cause the physiological curvature of the change or even disappear, which are not normal. Usually must pay attention to maintain normal sitting, standing and walking posture, do not strenuous exercise. Don’t use is to look down at the cell phone computer and so on, this is also will cause the physiological curvature change.