If the left side of the back pain, there may be several causes: first, lumbar muscle strain, if long-term work with the left side of the back to bend, can appear the left side of the lumbar muscle strain, can appear the pain of the back, then to carry out relevant CT, nuclear magnetic examination, to exclude other diseases. Second, kidney disease, when the kidneys have stones or tumors, inflammation, cysts, there will be pain on the left side of the back, then we should carry out ultrasound, CT and urine tests of the kidneys for further diagnosis. Third, the early stage of shingles, shingles can appear in the early stage of pain in the lower back, and at the same time can appear in clusters of herpes, then it is necessary to go to the dermatology department. Fourth, intercostal neuralgia, patients with intercostal neuralgia can have hidden pain or pins and needles-like pain or radiating pain in the lower back, which often requires nerve nutrition and closure therapy.