The causes of left-sided back pain in women are as follows: first, because the most common muscle tension, fasciitis and lumbar muscle strain, short-term sprains, strain or cold can cause acute back pain, long-term chronic lumbar muscle strain is mostly caused by poor posture, mostly because of sedentary, bent forward sedentary, crooked to watch TV or long-term driving, etc., which can cause lumbar muscle soreness or muscle tension, thus causing back pain These can cause soreness or muscle tension in the lumbar muscles, resulting in low back pain. Second, in women, young women should pay attention to exclude dysmenorrhea or gynecological inflammation, and older women need to pay attention to whether there is osteoporosis caused by lumbago or arthritis hyperplasia, etc. if they are already menopausal. Thirdly, past diseases of the lumbar muscle, such as lumbar disc herniation and sacroiliac arthritis, can also cause lumbar aches and pains. These can be common causes, rare causes to pay attention to whether there is abdominal pain, urinary urgency, painful urination and other such internal diseases caused by lumbar pain, there are such cases or pain for a long time does not relieve, to go to a regular hospital to check clearly, symptomatic treatment is better.