Back pain when lying down and no pain when standing up may be caused by lumbar diseases and urinary stones. 1. Diseases of the lumbar region itself: small joint dislocation of the lumbar vertebrae may cause the above symptoms, the main reason is that the joints are loose when lying down, stimulating the surrounding nerve roots to appear pain, when standing, the joints are tense and the symptoms disappear. In addition, patients with lumbar spondylolisthesis may also have the above symptoms, mainly due to the change of position, the soft tissues around the vertebral body to increase the holding force of the vertebral body, there is a reduction in the symptoms of the performance. 2. Urologic stones: urinary stones can cause colic in the back of the renal spine angle, back lying down on the pain standing pain, belonging to the change of body position. If the stone is less than 0.6cm, it can move with the change of body position and urine flushing, and it can be discharged out of the body due to the effect of gravity when standing up, so that the symptoms will be reduced or disappear. Back pain when lying down, standing without 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, under the guidance of the doctor to give targeted treatment or treatment.