Left-sided lumbago is related to gynecological diseases, which can occur when suffering from endometriosis and left-sided adnexitis. It is also related to other diseases, such as lumbar muscle strain, lumbar disc protrusion, lumbar diseases, etc. 1, female left side back pain and urinary system, digestive system diseases are also related, such as chronic gastroenteritis, acute gastroenteritis, peptic ulcer, urinary stones, etc. 2, female left side back pain and bad sitting habits, such as often crossed legs, body often tilted to the right, the left side of the muscle will be stretched to appear painful phenomenon. 3, overexertion can also cause left-sided low back pain, after proper rest, the symptoms of low back pain will be relieved. When left-sided low back pain occurs, we should pay attention to rest, avoid poor sitting posture, maintain a good routine, and at the same time, we should promptly conduct ultrasound examinations to identify the cause of the disease and adjust the symptoms to avoid aggravation.