There are several reasons for women’s back pain on the left side: 1, pelvic inflammatory disease, for women, cervical pelvic inflammatory disease or uterine adnexal inflammation, may lead to lower back pain, need to gynecological consultation. 2, urinary stones, if accompanied by urinary tract infections and stones, as well as polycystic kidneys, renal cysts, etc., can be accompanied by the left side of the lower back pain. Specific identification methods need to perform ultrasound of both kidneys and urine tests, which can help to clarify the diagnosis. 3, lumbar skeletal diseases, such as lumbar disc herniation, lumbar muscle strain, lumbar spine hyperplasia and the third lumbar vertebra transverse syndrome and other orthopedic disorders, can cause left-sided back pain, this type of disease, you need to take X-rays and lumbar MRI to help diagnose the disease. In most cases, pregnant women can also suffer from left-sided low back pain due to prolonged carrying of the child, etc. It is best to go to a specialized hospital for consultation.