Can I get the HPV 9-valent vaccine if I have only a little menstrual bleeding left?
Nine-valent usually refers to the nine-valent HPV vaccine, a vaccine designed to prevent human papillomavirus (HPV) infection. It is generally not recommended to receive the nine-valent HPV vaccine when menstruation is only just ending, as this may reduce preventive effectiveness, increase side effects, disrupt the menstrual cycle, lower immunity, and raise the risk of infection. The vaccine should be administered only after menstruation has completely finished.
1. Reduced preventive effectiveness
Residual menstrual flow indicates that menstruation has not fully ended. Receiving the nine-valent HPV vaccine during this period may reduce its effectiveness due to hormonal imbalances or incomplete recovery of immune system function.
2. Increased side effects
The nine-valent HPV vaccine may cause discomfort at the injection site such as swelling and pain, or other side effects like nausea, headache, and dizziness. During menstruation, physical condition is generally weaker; vaccination at this time may lead to more frequent or severe side effects.
3. Disruption of menstrual cycle
Vaccination may affect endocrine function, leading to increased menstrual flow, prolonged cycles, or irregular menstruation.
4. Reduced immunity
Immunity and resistance are relatively low during menstruation. If the nine-valent HPV vaccine is administered at this time and significant adverse reactions occur, immune function may decline further.
5. Increased risk of infection
During menstruation, the endometrium and cervical mucosa are thinner. The immune response triggered by the nine-valent HPV vaccine may temporarily reduce resistance, thereby increasing susceptibility to infections.
In general, the nine-valent HPV vaccine can be administered 3–7 days after menstruation ends. After vaccination, individuals should monitor their physical condition closely. If obvious symptoms such as swelling or hard nodules develop, prompt medical attention is advised.