Left lower back pain can be caused by the following reasons: first, herpes zoster, in the early stage of herpes zoster can appear lower back pain, in the incubation period of 1-2 weeks later can appear in groups of herpes, this time to early to the dermatology department for diagnosis and treatment. Second, intercostal neuralgia, when the back of the intercostal nerve course of chronic inflammation, there can be intercostal nerve course of pain, can be hidden pain, stabbing pain or radiating pain, this time to early diagnosis of physical examination, early physical therapy, as well as closure therapy, nutritive nerve therapy. Third, kidney disease, when there is pain and percussion pain in the kidney area, it can be caused by kidney tumor or inflammation, stones, cysts, which should be diagnosed by CT, ultrasound and urine test of kidney at an early stage.