The soreness and pain of the left rear back, there are generally the following points: first, muscle tension fasciitis, lumbar muscle strain, because of long-term poor posture, such as long-term low head ambulation work or bending weight, squatting work, sedentary time is relatively long, can cause muscle soreness, so lumbar disc herniation can also cause muscle soreness in the back, because the nucleus pulposus protrusion stimulates the nerve roots, can cause local muscle tension, but also It can stimulate the peripheral nerves to cause soreness. Second, lumbar soreness also needs to pay attention to whether there is abdominal pain, nausea, urinary urgency, painful urination and diarrhea, etc. Gastrointestinal diseases and urinary system diseases can also cause lumbar swelling and soreness, especially urinary stones and ureteral stones, which can cause very serious pain in the lumbar region. Third, common lumbar pain, if in women there are also gynecological diseases, so you need to pay attention to the various reasons above, observe the timely examination.