The reason why elderly women have recurrent urinary tract infections, according to clinical experience, may be related to the following points: 1, anatomical aspects, because the pelvic floor muscles of elderly women are relaxed, the opening of the external urethra is also relaxed, coupled with the existence of paraurethral cysts in some elderly women, urethral mucosa prolapse, urination is not smooth, bacteria are easy to stay or retrograde infection, and cause urinary tract infections. 2, treatment is not standardized, antibiotic treatment The patient will stop the medication on her own, but the bacteria will not be completely eradicated at this time, and will develop again when the resistance is low, and repeated medication will also make the bacteria produce drug-resistant strains. 3, some elderly women have basic diseases such as anemia, low protein, malignant tumor, diabetes, etc. 4, some elderly women due to the decline or decrease in estrogen levels. The dryness of the vulva makes the normal flora of bacteria in the vulva dysfunctional, coupled with the chronic age-related vaginitis, thus causing recurrent urinary tract infections.