Viruses
Catching certain kinds of viruses can indirectly increase your risk of cancer. That’s because in some situations, viruses trigger genetic changes in cells that can contribute to cancer. The CDC says: “Some viruses linked to cancer are the human papillomavirus (HPV), which causes cervical cancer; hepatitis B and C viruses, which can cause liver cancer; and the Epstein-Barr virus, which may cause a type of lymphoma. Also, the H. pylori bacterium can cause gastric cancer.”