The term “great aunt” is generally used to refer to a woman’s menstrual period. Generally speaking, vaccines do not affect the delay of menstruation. Vaccines are made from attenuated or inactivated pathogenic microorganisms, and their main purpose is to react with the body’s immune system to produce antibodies and increase the body’s immunity to certain infectious diseases. After vaccination, a series of adverse reactions such as dizziness, pain at the injection site, nausea, diarrhea, fever, etc. may occur, and will not cause delayed menstruation. There are many reasons for women to experience delayed menstruation, which may be caused by physiological factors, such as pregnancy, breastfeeding, perimenopause and so on. It may also be caused by pathological factors, such as uterine adhesions, polycystic ovary syndrome, pituitary tumors, etc. If menstruation is delayed for more than 7 days after vaccination, then it is recommended to go to the hospital to find out the cause and then treat it.