9-valent generally refers to the 9-valent HPV vaccine. The advantage of the 9-valent HPV vaccine for women is that it can prevent HPV viral infections and reduce the prevalence of virus-related diseases, while the disadvantage is that the vaccine may have some side-effects, and the body may experience some discomfort after vaccination. The 9-valent HPV vaccine can prevent HPV6, 16, 18, 11, 31, 33, 45, 52, 58 viral infections, after vaccination can stimulate the body to produce antibodies, effectively reducing the prevalence of virus-related diseases, such as cervical cancer, anal cancer, vulvar cancer, warts, etc., standardized inoculation is a kind of protection for women. However, the vaccine also has certain side effects. Side effects observed in the female population before and after the vaccine was launched include headache, nausea, fatigue, dizziness, pain and swelling at the injection site, etc.; some females may experience allergy due to their physical condition, resulting in itchy skin and other manifestations, but most of the adverse reactions are mild to moderate, and of short duration, with no after-effects. The vaccination age of 9-valent HPV vaccine is between 16~26 years old, and it is necessary to interview the doctor to exclude all kinds of contraindications before the vaccination, and after the vaccination, it should be observed in the hospital for 30 minutes, and there is no abnormality before you can leave.