The reason for back pain sitting pain, mainly in the sitting position, the pressure within the intervertebral disc increases, the intervertebral disc will expand, protrude, and prolapse around, stimulating and compressing the adjacent sciatic nerve or sinus spinal nerve, and there will be increased back pain. The reason why it is not painful to lie down is that the muscles of the lumbar region are relaxed when lying down, the lumbar intervertebral discs are no longer compressed, the intervertebral space is widened, the degree of expansion, protrusion and prolapse is reduced, the stimulation and compression of the nerves is reduced, so the pain is reduced when lying down, or there is no pain at all. Therefore, in general, patients with low back pain should lie more and sit less, stand less, stand less and walk less.