UTI to menstruation may lead to aggravation of UTI for the following two reasons: 1. The resistance of the body becomes poor when the patient has menstruation, leading to aggravation of UTI. 2. The patient has to use sanitary napkins when she has menstruation, which affects the microenvironment around the urethral opening and also aggravates UTI. And when the urethral infection comes with menstruation, because menstruation may cause false positives for urinary routine. So when a patient has a UTI with menstruation, you can check the blood routine or urological ultrasound, and also observe whether the patient has chills, high fever, and back pain. If the patient has symptoms such as chills, high fever and back pain, intravenous antibiotic treatment is recommended. If there are only simple symptoms such as frequent urination, urgent urination and painful urination, oral antibiotics or drinking more water are recommended for treatment.