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Cancer causes: Popular myths about the causes of cancer

Myth: Cancer is contagious.

Fact: There's no need to avoid someone who has cancer. You can't catch it. It's OK to touch and spend time with someone who has cancer. In fact, your support may never be more valuable.

Though cancer itself isn't contagious, sometimes viruses, which are contagious, can lead to the development of cancer. Examples of viruses that can cause cancer include:

  • Human papillomavirus (HPV) — a sexually transmitted infection — that can cause cervical cancer and other forms of cancer
  • Hepatitis B or C — viruses transmitted through sexual intercourse or use of infected IV needles — that can cause liver cancer

Talk to your doctor about vaccines and other ways to protect yourself from these viruses.