Stinging pain in the vagina or vulva after using metronidazole tablets may be due to inflammatory irritation that causes vulvar or vaginal ulcers and stinging pain after using the medication. It is also not excluded that allergy to metronidazole tablets may cause stinging pain in the vulva and vagina, and that the wrong medication may also cause stinging pain in the vulva or vagina. If there is pain and discomfort in the vulva after using the medication, stop the medication and use a douche to flush out the drug residue from the vagina for observation. If the stinging pain is significantly reduced after flushing out the drug residue, it may be caused by drug allergy. If women have vulvar and vaginal itching symptoms, they should seek regular leucorrhea examination and give effective treatment according to the examination results.