Precautions for female cystitis are as follows: 1. Adolescent females, the onset is related to menstruation and sexual life, resistance decreases before and after menstruation, need to drink more water, avoid intercourse when straining or try to urinate before and after intercourse; 2. Postmenopausal females, related to estrogen, vaginal environment, bacterial changes, if recurrent, estrogen can be used to improve the vaginal environment, improve lactobacillus, increase resistance and reduce recurrence, appropriate milk consumption, which is helpful for recovery.