Lumbar pain lying down does not hurt stand up pain may be suffering from lumbar disc herniation, lumbar muscle strain, or lumbar spondylolisthesis, lumbar dorsal musculoskeletal fasciitis and so on. 1. Herniated lumbar intervertebral disc: If the patient suffers from herniated lumbar intervertebral disc, the protruding part will compress the adjacent nerve root and cause lumbar pain, the compression of the nerve root is relieved when lying down, so the lumbar pain is relieved, and the lumbar intervertebral disc will be squeezed in the standing state, and the pain will be felt. 2. Lumbar muscle strain: If the patient’s lumbar muscles are strained, it may cause lumbar pain. When lying down, the lumbar muscles are more relaxed, so the pain is not obvious, but when standing up, the lumbar muscles are pulled, and the pain will be felt. 3. Lumbar spondylolisthesis: If the patient suffers from lumbar spondylolisthesis, it can also cause this condition. When the patient lies down, the lumbar muscles are relaxed, the lumbar vertebrae are stable, and there is no compression of the nerves. When the patient stands up, the lumbar spondylolisthesis is aggravated, and the vertebrae are displaced to compress the nerves, and lumbar pain will occur. 4. Lumbar dorsal myofasciitis: patients in bed rest when the fascia is relaxed, in standing when the lumbar myofascia is pulled to cause pain. There may be many other reasons why the low back pain is not painful when lying down and pain when standing up, the patient should go to the hospital in time for examination to clarify the cause of the disease and then consult a doctor.