Women’s left back pain may be physiological factors, lumbar muscle strain, lumbar disc herniation, pelvic inflammatory disease, ureteral stones and other factors. 1. Physiological factors: such as exercise for a long time, may lead to the accumulation of lactic acid metabolites in the lumbar muscles, will cause the symptoms of left back pain, belong to physiological factors. 2. Lumbar muscle strain: prolonged excessive bending or lumbar cold may induce lumbar muscle strain, which can lead to the left back pain, and there are pressure points, in the bending or cold, the pain will be aggravated. 3. Intervertebral disc herniation: it may be related to acute injury or lumbar degeneration, which may lead to lumbar intervertebral disc herniation, which may cause left back pain, and may be accompanied by numbness of the lower limbs as well as pain in the lower limbs and other symptoms. 4. Pelvic inflammatory disease: due to the presence of inflammatory infections in the pelvic cavity, it can lead to left back pain, which may also be accompanied by lower abdominal pain, increased vaginal discharge, discharge odor and other symptoms. 5. Ureteral stones: may be secondary to kidney stones, when the stones cause irritation to the ureter, it will cause left lower back pain, the pain may be more intense, accompanied by frequent urination, hematuria and other symptoms. Women left back pain, and exclude the physiological factors, should be alert for disease factors, should be examined and treated.