Lumbar pain and distension may be related to lumbar muscle strain, urinary system diseases, lumbar spine disease, pelvic inflammatory disease and so on. 1. Lumbar muscle strain: long-term stooping work makes the lumbar muscle chronic injury, fascia and soft tissue congestion and edema, causing lumbar soreness and distension symptoms. 2. Urological diseases: such as pyelonephritis, kidney stones, tumors, etc., because of the irritation and compression to the ureter or the posterior peritoneum may also appear lumbar pain and distension phenomenon. 3. Lumbar spine diseases: including lumbar disc herniation and lumbar spinal stenosis, lumbar spine diseases will compress the nerves, not only the symptoms of lumbar soreness and distension, but also the symptoms of the lower limbs. 4. Pelvic inflammatory disease: If a woman is suffering from low back pain, it may also be a gynecological disease, such as pelvic inflammatory disease, because pelvic inflammation stimulates the posterior peritoneum, and there will be symptoms of low back pain. It is recommended to go to the hospital in time to improve the relevant examination to identify the cause of the symptoms of back pain and distension, targeted treatment.