The main aspects of back pain are as follows: 1. lumbar muscle strain or third lumbar transverse synovial syndrome, which is common after exertion or cold, due to muscle and fascia ischemia, hypoxia, resulting in the accumulation of metabolic waste lactic acid, and soreness, pain, bending activity is limited, lumbar muscle weakness, etc. 2. lumbar disc herniation, lumbar disc herniation compression of the posterior nerve, resulting in lumbar soreness, pain with limited activity, 3. urological disease, when there is a renal pelvic effusion or inflammation, the lower extremities are prone to swelling, pain with numbness. 3. urological diseases, the presence of pelvic effusion or inflammation can easily lead to lumbar swelling and pain, which can be clarified by ultrasound examination. 4. tubal or ovarian inflammation, for female patients, gynecological diseases can also easily lead to lumbar swelling and discomfort, especially tubal and ovarian inflammation, due to the presence of inflammation. Most patients will have increased vaginal discharge with fishy odor, which can be clarified by gynecological examination.