The pain on the left side of a woman’s back can be caused by several reasons: first, herpes zoster, in the early stages of herpes zoster can appear on one side of the back pain, often hidden pain or stabbing pain, after the incubation period can be clusters of herpes, this time to early diagnosis and treatment to the dermatology department. Second, intercostal neuralgia, intercostal neuralgia patients can appear on the back of one side of the intercostal nerve pain, often hidden pain, radiating pain, then early examination to diagnose, early nerve nutrition and closed treatment. Third, rib diseases, when there is a tumor or metastasis in the ribs, there can be pain at the ribs, then early CT and ECT of the ribs should be taken for early diagnosis and early treatment. Fourth, lung diseases, when there is a tumor in the lung, some patients can also have pain in the back, so CT of the lung should be taken for early diagnosis. Fifth, heart disease, if the heart has a heart attack or angina pectoris, the pain in the back can also appear radiologically, then early examination of the heart ultrasound, imaging and blood tests to diagnose.