The purpose of vaginal douches is to improve the pH environment of the vagina and to avoid damaging the self-purifying function of the vagina in order to prevent the occurrence of bacterial, viral, or specific pathogen infections. Normally, it is generally recommended to use water douching to prevent damaging the self-purifying ability of the vagina. However, during menstruation, avoid douching directly into the vagina to prevent external bacteria from being brought into the vagina and causing vaginal infections, or even upstream infections leading to pelvic inflammatory disease. Vaginal douching is mainly used for patients suffering from vaginitis, or patients who need to undergo reproductive system surgery. It is important to keep the perineum clean, dry and hygienic, and to avoid multiple sexual partners to prevent the possibility of infection.