One side of the back pain may have the following reasons: First, lumbar muscle strain, if long-term use of one side of the waist for work or labor, there will be a side of the lumbar muscles of chronic injury, which leads to one side of the back pain. Second, lumbar dorsal fasciitis, if long-term exposure to cold, exertion or stooping to hold objects, can also appear lumbar dorsal fasciitis, can appear on one side or both sides of the back of the waist pain. Third, kidney disease, when the kidney tumor, inflammation, stones or cysts, there can be one side of the lower back pain, this time to carry out kidney CT, ultrasound and urine tests for diagnosis and treatment. Fourth, herpes zoster, in the early stage of herpes zoster can also appear on one side of the waist pain, after the incubation period can appear herpes, then to the dermatology department for diagnosis and treatment. Fifth, intercostal neuralgia, intercostal neuralgia patients can appear on the left side of the lumbar region of the intercostal nerve travels at the pain, often need to carry on the treatment of nutritional nerve drugs as well as closed treatment.