HPV vaccine is an inactivated virus vaccine, which does not affect the normal physiological cycle of women after injection. If menstruation is delayed after HPV vaccination, it is generally considered that it is not related to the vaccine, but may be caused by pregnancy, mental factors, drugs, endocrine disorders or certain organic diseases: 1. pregnancy: menopause may be the earliest and most important symptom of pregnancy, which can be assisted by positive blood and urine HCG. Diagnosis of early pregnancy; 2, mental factors: mental stress can cause endocrine disorders in women, resulting in menstrual disorders, it is recommended to improve the poor lifestyle, appropriate exercise, adjust emotions, avoid excessive stress; 3, drug factors: long-term use of a variety of contraceptives, affecting the normal function of the body, can lead to the occurrence of delayed menstruation, according to their own situation, appropriate to reduce or stop the application of such drugs; 4 The phenomenon of delayed menstruation after HPV vaccination occurs due to changes in the hormone level of the body caused by endocrine disorders. You should avoid the causes of endocrine disorders, maintain a good mood, and follow medical advice for drug treatment if necessary, such as hormonal drugs; 5. Organic diseases: such as chronic hepatitis, tuberculosis, etc., often cause delayed periods, so you should go to the hospital promptly and follow medical advice to choose drugs or surgery to treat these diseases and improve the symptoms of delayed periods. It is normal for women to delay their periods occasionally, but if the delay is long and symptoms such as bleeding occur, you need to go to the hospital, find the cause and treat the cause.