The third vaccine, usually the new coronavirus vaccine, does not usually have a direct effect on menstruation, but it may affect menstruation to some extent if you are emotionally disturbed during the vaccination or if you do not get enough rest after the vaccination. The new coronavirus vaccine does not contain hormone components, so there is no effect on menstruation after receiving the booster shot of the new coronavirus vaccine. If there are abnormalities in menstruation after vaccination, it is recommended to consult a doctor to find out the cause. However, if you are too nervous, anxious or worried during vaccination, or if you stay up late, have insomnia or overwork for a long period of time before or after vaccination, which results in endocrine imbalance in your body, you may experience menstrual disorders and be mistaken that the booster shot of the new coronavirus vaccine has an effect on your menstruation. After receiving the booster shot of the new coronavirus vaccine, one should avoid localized exposure to water, pay attention to rest, and avoid staying up late, consuming spicy and stimulating food, drinking alcohol, etc., in order to avoid adverse reactions and the ineffectiveness of the vaccine.