Low back and leg pain is a common and frequent clinical disease, some of which are mainly low back pain, some of which have both low back pain and leg pain, and some of which are mainly manifested by the soreness, numbness and swelling of the legs. The clinical diagnosis for low back pain relies on X-rays or CT and MRI, and the conclusion is relatively regular and patterned: i.e. X-rays: lumbar spine osteophytes and degeneration, CT and MRI scans: L45, L5S1 disc protrusion and bulge, etc. Patients often care a lot about pathology reports such as osteophytes and disc herniation, but in fact osteophytes and lumbar disc herniation degeneration are a manifestation of human aging, and normal people will also experience the above changes at a certain age. After learning and clinical exploration, I have summarized the following points for the pathogenesis and treatment of lumbar and leg pain: 1, the cause of the onset of lumbar and leg pain, one is due to long-term bending work, such as farmers farming, or long-term sitting posture labor, such as assembly line workers, the onset of such people is mostly chronic, starting with lumbar pain and discomfort, slowly appear waist hip, followed by leg symptoms. Second, due to falls or trauma to the lumbar region, there are many patients who have a history of falls and injuries, and have old problems in the lumbar region, and only at a certain age do they have an attack. These people tend to have an acute onset, and once they appear, they have obvious back and leg pain. Third, it is caused by improper maintenance before and after the birth of a child, or caused by anesthesia in the lower back, or caused by too many hip injections in early childhood. 2, the pathology of lumbar and leg pain: strain, sprain, long bending → sacrospinous muscle (red area) or thoracolumbar fascia (blue area) attachment congestion and edema → lumbosacral vertebral plate (red area) and deep fascia (blue area) periosteum attached to the tip of L34 transverse process are inflamed and stimulated → local pressure pain and/or radiating pain and other clinical symptoms. Symptoms dominated by injury in the red region are equivalent to lumbar disc herniation, and its location is also equivalent to the lumbar 4-lumbar 5-sacral 1 disc, often presenting with lumbosacral pain, pain behind the buttocks, and numbness and pain in the back and side of the leg. Patients often wake up in the morning with pain and even pain. Blue area injury-based performance is equivalent to lumbar muscle strain, whose main manifestations are soreness on both sides of the waist, inflexible activities, obvious after sitting and standing for a long time, pain and numbness in the buttocks, lateral and anterior side of the thigh, and groin pain. 3, the fundamental method of treatment of lumbar and leg pain: the use of small needle knife or blade needle therapy, for the above-mentioned parts of the muscles, fascia and other soft tissues to do treatment, needle knife or blade needle to loosen the muscles and fascia, release the adhesions between the muscles and fascia, reduce pressure, improve blood circulation, eliminate sterile inflammation, so that the muscles return to normal form (softening), the pressure between the intervertebral discs will naturally be reduced, the compression caused by the herniated discs will also Because the bone joint itself does not have the power to maintain its position, the power comes from the muscles and ligaments, only after the tension of the muscles and ligaments is lifted can the dynamic balance of the bone joint be achieved, if only according to the results of the imaging examination, only for the bones and intervertebral discs to do treatment, the effect will not be ideal. 4, a very small number of patients with lumbar and leg pain, accompanied by lower limb weakness, diaphoresis, but can not find any painful points in the lumbar region, clinical symptoms consistent with the imaging diagnosis, does not belong to the scope of treatment of acupuncture and blade needle, pay attention to the distinction.