Lumbar pain for a few days may be caused by stones leading to fluid retention, but lumbar muscle strain, lumbar disc degeneration and other diseases can not be ruled out, it is recommended that further examination to clarify the cause. 1. The presence of kidney stones alone may cause pain in the lower back; when kidney stones or ureteral stones block the urinary tract, it will cause fluid retention in the kidneys, which will dilate the renal peritoneum and stimulate the nerves will also cause the symptoms of low back pain. 2. In addition to kidney stones, lumbar pain often occurs when there is lumbar muscle strain in the lower back and aseptic inflammation such as lumbar dorsal fasciitis due to sedentary behavior and improper posture. 3. When there is degeneration of the lumbar disc, the nucleus pulposus is mildly bulging, resulting in stimulation of the annulus fibrosus, but not yet fractured, also due to the stimulation of the lumbar soreness and distension. Therefore, lumbar pain may be caused by stones and other reasons, it is recommended to go to the hospital for further examination to clarify the cause of the disease.