If the back pain, and pulling leg pain, the following causes are common: first, lumbar disc herniation: is the most common cause of back and leg pain, most patients are middle-aged and elderly patients, due to long-term, excessive weight bearing, so that weight gain, resulting in lumbar disc degeneration, which causes nerve compression, the patient will have lumbar pain, and accompanied by radioactive leg pain, CT, MRI can determine the diagnosis. Secondly, lumbar back fibrositis: it will also cause lumbar pain as well as radiating pain in the legs, the patient will not have restricted movement of the lumbar spine, and pressing the painful points of the lumbar dorsal fascia will instead lead to relief of leg pain, mostly seen in patients who maintain a fixed sitting posture for a long time. If the above clinical symptoms appear, early diagnosis and early treatment are necessary to achieve significant relief of low back pain and avoid aggravation of the condition.