Lumbar lying does not hurt stand up and bend down on the pain to consider lumbar disc herniation, lumbar muscle strain and other reasons. 1. Lumbar intervertebral disc herniation: lumbar lying down when the lumbar general will not force, lumbar intervertebral discs will not be compressed, will not cause compression of blood vessels and nerves, so it will not cause pain, but if the lumbar intervertebral discs are squeezed when bending, compression of the nerves and blood vessels, which will cause lumbar pain, numbness of the lower limbs and other symptoms. 2. lumbar muscle strain: this is due to lumbar muscle injury caused by inflammation, the human body lying down, the lumbar muscles will not force and pull, so no pain symptoms, when standing or bending, the muscles are pulled and force, it will trigger the symptoms of lumbar pain. Lumbar lying without pain standing up and bending over pain may also have other reasons, it is recommended to go to the hospital in time to improve the examination to clarify the cause of the disease, to give targeted treatment or treatment.