If the patient has back pain when sleeping flat on his back, then it may be related to the following causes: 1. It may be caused by the problem of the bed, which may be too hard or too soft. Too hard may make the patient’s spine long-term excessive tautness, so that the back side of the spinous process may compress the surrounding soft tissues, resulting in pain around the spine. The bed is too soft, the spine may be in a long-term excessive curvature, like the shape of the cat’s spine, so that the muscles around the spine spasm, and then cause low back pain. 2, there may be scoliosis, the situation, often due to the deformity of the spinal column leads to the patient in the supine position, a certain part of the spine, such as the lumbar region by excessive compression, or so that the surrounding muscles spasm, and then cause pain. Pain.