Lying in bed for a long time back pain may be caused by diseases of the lumbar region itself, may also be due to urinary stones. 1. Lumbar diseases: lying in bed to rest if the hardness of the mattress is not appropriate, may cause lumbar myofascial tension and spasm, vertebral pressure increases, etc., a long time may appear lumbar pain symptoms, such as myofascial fatigue induced by lumbar dorsal fasciitis, vertebral body sustained high-pressure induced lumbar degenerative pathology lumbar disc herniation, etc.. 2. Urinary stones: sleep at night rest time is longer, if the daytime water is usually not enough or have the habit of getting up in bed to hold urine, may lead to urinary stones. Small stones can be flushed out of the body with urine, large stones if lying in bed at night in a position unchanged, may cause obstruction of the urinary system, resulting in radiating pain in the lower back. Lying in bed for a long time back pain may also have other reasons, it is recommended to go to the hospital in a timely manner, improve the examination to clarify the cause of the disease, under the guidance of the doctor to give targeted treatment or treatment.