There are many causes of lumbar pain accompanied by fever, mainly due to injury or infection in the lumbar abdomen or adjacent parts, and the common clinical diseases are as follows: 1. lumbar spine disease 1. lumbar spine tuberculosis infection: manifested as lumbar pain and fever, which should be treated with bed rest, and can be treated with anti-tuberculosis drug therapy, and if necessary, surgical treatment such as incision and drainage of pus and removal of lesions can be taken; 2. lumbar spine interstitial infection: can be manifested as chills, High fever, increased pain in the lumbar back, which can be treated with adequate antibiotics, or local drainage, surgery, etc.; 3. Soft tissue strain in the lumbar region: swelling of the lumbar muscles can occur, and repeated pulling and rubbing during activities can lead to increased edema, thus causing symptoms of pain and fever in the lumbar region. Attention should be paid to rest and avoid excessive activities so that the damaged tissues can be fully repaired. If the pain is obvious, the local can be treated with anti-inflammatory and analgesic ointment, ointment, or oral anti-inflammatory and analgesic drugs; 4, ankylosing spondylitis: a few patients may be feverish, usually the disease starts slowly and insidiously, the early symptoms are swelling and pain in the lumbosacral region and morning stiffness, waking up in the middle of the night with pain and difficulty turning over, which is reduced after activity. As the disease progresses, it develops from the lumbar spine to the thoracic and cervical spine, and pain or spinal deformity occurs in the corresponding areas. Pelvic inflammatory disease can be manifested as lumbago or lower abdominal pain, increased vaginal discharge, and in severe cases, chills, high fever, headache and other systemic symptoms, which can be treated with antibiotics and other drugs for anti-inflammatory treatment. Urinary stones with infection may manifest as fever and severe lumbago. Drink more water to help flush the bladder and reduce the symptoms of infection.