Low back pain may be caused by the following reasons: first, lumbar muscle strain, if the long time bending work or sedentary work, there can be chronic injury to the lumbar muscles and lead to low back pain, often accompanied by symptoms of soreness, then to conduct relevant physical examination to exclude other diseases for diagnosis; second, lumbar dorsal myofasciitis, lumbar dorsal myofasciitis patients can appear chronic aseptic inflammation of the lumbar dorsal muscle fascia, and lead to symptoms of low back pain, then to conduct relevant physical examination for diagnosis, to early physical therapy and oral medication; third, kidney disease, when there is nephritis or oral medication, to early physical therapy and oral medication. Third, kidney disease, when there is nephritis or kidney tumor, in the early stage can also appear symptoms of lumbar pain, then we have to carry out CT and ultrasound examination of the kidney for early diagnosis, if necessary, urine tests; fourth, kidney deficiency, kidney deficiency can also appear lumbar pain. Fourthly, kidney deficiency can also occur in the case of lumbar pain, accompanied by weakness of the knees, which should be diagnosed by taking pulse in the Chinese medicine department for early diagnosis and treatment.