Many people know that people with lumbar disc herniation should sleep on a hard bed. For this reason, some people go through the trouble of replacing their comfortable mattress with a hard board bed, while others just add a wooden board on top of the mattress. However, they feel uncomfortable again when lying on a hard board bed. So, is it necessary for patients with back pain to choose a hard bed? What are the reasons? The human spine has four normal physiological curvature, respectively, the anterior protrusion of the cervical and lumbar vertebrae, the posterior protrusion of the thoracic and sacral vertebrae, the hard bed can give full support to the spine when lying down, to avoid the spine in an abnormal bending position. At the same time, bed rest helps to reduce the pressure of the intervertebral discs, good lying posture is more conducive to maintaining the normal curvature of the lumbar spine, reduce the tension of the ligaments behind the lumbar spine, relax the lumbar muscles, thereby reducing the symptoms of lumbago. But the hard bed also has its drawbacks. Due to the lack of elasticity, in some thin or elderly patients, the bed when the bone protrusions by the extrusion of the bed plate will feel very uncomfortable, especially the elderly patients are more likely to lead to bedsores. Therefore, when we choose a mattress, should feel “comfortable” and “soft and hard” as the standard, do not have to be overly bound to the “hard bed”. Mattress is too hard, the body and mattress contact with the relative pressure increases, will cause discomfort; mattress is too soft, it is difficult to maintain the normal curvature of the lumbar spine, so that the waist does not get a certain support and easy fatigue; and mattress elasticity is too large, but also easy to make the waist constantly by the role of external elasticity, muscle tension and injury, the waist muscles can not get a good rest and pain.