Cystitis may cause low back pain, often due to incomplete and untimely treatment of cystitis leading to further spread of inflammation up the urinary tract, and the development of pyelonephritis will result in low back pain or fever, which may be accompanied by significant urinary tract irritation. If lumbago occurs, intravenous infusion is required. Before intravenous infusion, it is recommended to obtain a urine culture and give a drug sensitivity test, and select an antimicrobial agent for treatment based on the culture results and drug sensitivity test. Second-generation cephalosporins, such as cefuroxime sodium for injection or cefoxitin sodium for injection, or quinolones, such as levofloxacin hydrochloride or moxifloxacin injection, are often used for clinical treatment. In addition, moderate rest is needed to avoid overexertion. At the same time, it is necessary to keep the vulva clean and hygienic, and it is also necessary to keep a certain amount of urine, and drink more water to urinate more, which can accelerate the metabolism of drugs after drinking more water. It can also discharge the urine containing bacteria as soon as possible, and more urination can also play the role of flushing the urinary tract and reducing the adhesion of bacteria to heal faster.