The HPV vaccine is an inactivated virus vaccine, which may cause local pain at the injection site, slight dizziness after injection, and fever, fatigue, muscle or joint pain. If you get your period after HPV vaccination, it may be a normal menstruation. The normal menstrual cycle is about 28 days, and a delay or advance of 7 days is normal. If there is an abnormal menstrual cycle, it is likely that the onset of menstruation is due to endocrine disorders caused by mental stress, excessive dieting, environmental changes and other factors, and is not directly related to the vaccination. Menstruation after HPV vaccination does not have any adverse effect on the efficacy of the vaccine or the effect of the vaccine and does not require special treatment. However, women should pay attention to menstrual hygiene and avoid having sex during menstruation. They should also pay attention to keeping warm during menstruation, especially keeping the abdomen warm to ensure smooth discharge of menstrual blood.