The exact location of the waist should be in the position between the back and the buttocks, generally from the outside, up to parallel with the bottom one rib’s and down to parallel with the top of the iliac bone, the middle part is the location of the waist. The location of the waist mainly has the lumbar vertebrae, lumbar disc, but also the starting point of the sciatic nerve, and the parts on both sides contain the kidneys. The lumbar region is the most important weight-bearing part of the body and is particularly vulnerable to injury. If you do not pay attention to maintenance, you are likely to suffer from lumbar osteophytes, lumbar disc bulge, lumbar disc herniation, lumbar strain and other diseases. If the condition is more serious, the compression of the sciatic nerve will also cause radioactive pain in the legs. So usually you must strengthen the protection of the waist, avoid sitting and standing for a long time, avoid getting cold, and avoid lifting heavy objects to avoid lumbar diseases.