Why do people get cancer? There are many different answers: some say it’s genetic, some think it’s exposure to carcinogens, some think it’s environmental pollution, and some blame “bad luck” …… Some cancers can be contracted chronically through viral infections. In a sense, some cancers are “infectious”. In China, hepatitis B/C virus, Helicobacter pylori, human papilloma virus (HPV) and EBV are the most common cancer-causing infections, according to Qiao Youlin. Although infection and cancer are not directly causally related and will not “kill” each other, the germs will quietly lurk in our body and wait for an opportunity to strike. This process takes about 10 years or more. If we can interrupt the spread of infection and eliminate them in the cradle, we can effectively prevent cancer from occurring. Four types of cancers are “contagious” 1. Cervical cancer Infectious virus: HPV human papillomavirus Transmission routes: sexual transmission, close contact, indirect contact (through the infected person’s clothing, household items, utensils, etc.), medical source infection (medical personnel infect themselves during treatment and care), mother-to-child transmission (from infants through close contact with pregnant women’s birth canal) Prevention: Currently, only prophylactic vaccines are available to prevent 4 types of HPV infection. Circumcision of male overcircumcision is an important measure to prevent cervical cancer in women, and also to prevent men from contracting various types of STDs themselves. 2.Hepatocellular carcinoma Infectious virus: Hepatitis B virus Transmission routes: blood transmission, mother-to-child transmission, sexual transmission Prevention: timely vaccination, active treatment after infection, pay attention to various medical instruments used for injection, vaccination, tattooing, etc., and use condoms during sex life. 3.Stomach cancer Infectious bacteria: Helicobacter pylori Transmission route: mouth-to-mouth transmission, sneeze transmission Prevention: Patients with chronic gastritis should avoid mouth-to-mouth feeding of young children; patients also need to pay attention when kissing with others; when patients sneeze, bystanders should turn around and keep a distance of 1 meter. 4.Nasopharyngeal cancer Infectious virus: EB virus Transmission route: saliva transmission Prevention: EB vaccination, avoid mouth-to-mouth transmission and sneeze droplet transmission. How to prevent cancer “infection” First, vaccination. Data from Taiwan shows that since 1984, 95% of infants and children were vaccinated against hepatitis B. 20 years later, the number of hepatitis B carriers decreased from 10% to 20% to 0.2%, and the incidence of liver cancer also decreased by 70% to 80%. Second, early treatment. H. pylori can be completely eradicated by combined antibiotic treatment, which not only relieves gastritis and gastric ulcer, but also plays a good role in resistance to further development of gastric cancer. Again, get screened. women over 30 years old, make sure to get regular cervical screening. Also protect yourself by paying attention to using condoms, not having sex too early, limiting the number of sexual partners, etc. Finally, split meals. H. pylori and other germs are highly contagious and can be transmitted through hands, food and utensils, so it is best to implement a meal sharing system, use communal chopsticks and spoons when having meals together, and isolate infected people in the family.