Acute cystitis does not require hospitalization, only outpatient treatment, but special cases require hospitalization, such as acute cystitis with chills or elevated body temperature in addition to acute urinary tract irritation symptoms. Hospitalization is more effective if there is a high white blood cell count in routine blood tests and if there are definite drug-resistant bacteria in the urine culture. After hospitalization, continuous treatment with intravenous antimicrobials is possible. It is possible to dynamically observe the improvement of the patient’s symptoms and adjust the medication in time. In addition, if the results of outpatient treatment are not satisfactory, and bacterial resistance occurs, or there is a gradual increase in body temperature, chills, or the presence of pyuria, it is necessary to change from outpatient to inpatient treatment to conduct urine culture tests and select more sensitive antibiotics for intravenous infusion after the drug-carrying bacteria are identified, so as to cure the infection of drug-resistant bacteria early and prevent further development of pyelonephritis. This can prevent further development of pyelonephritis or a series of serious complications such as urinary tract abscess or perinephritis.