The left side of the back pain may be caused by the following reasons: first, shingles, in the early stage of shingles can appear on one side of the waist pain, can be hidden pain or stabbing pain, in the incubation period of 1-2 weeks after the herpes can appear, this time to early diagnosis and treatment to dermatology. Second, intercostal neuralgia, patients with intercostal neuralgia can have pain on one side of the intercostal nerve, which can be hidden pain, stabbing pain or radiating pain, which should be diagnosed by early physical examination and treated by early nerve nutrition and closure. Third, kidney disease, when the kidneys have tumors, inflammation, stones, cysts, there can also be pain on the back side, then we should check the kidney ultrasound, CT and urine tests to diagnose and treat. Fourth, dermatome neuritis, patients with dermatome neuritis can also have inflammation of the dermatome nerve on one side of the back, resulting in pain in the distribution area, which should be diagnosed by early physical examination and early nerve nutrition and physical therapy.