Lumbar soreness and swelling for several days may be due to exertion factors, lumbar disc herniation, kidney disease produced by the symptoms. 1. Exertion: prolonged exertion or sitting for a long time will increase the burden on the lumbar, and the symptoms of persistent soreness and swelling may lead to lumbar muscle strain. 2. Herniated lumbar disc: prolonged lumbar soreness may be a symptom before herniated lumbar disc, the nerve compression in the spinal canal will lead to localized soreness, numbness and other symptoms. 3. Kidney disease: chronic pyelonephritis, there will be soreness and swelling in the lower back, and there will be percussion pain, mainly due to infectious factors, long-term drug-induced damage to the kidneys. Soreness and swelling of the waist for several days may be the precursor of other diseases such as pelvic inflammatory disease, spinal tuberculosis and spinal tumors, etc., which should be promptly consulted for a clear diagnosis and targeted treatment.