Genetic mutations that allow tumors to grow and that prevent the body from fighting those tumors are the primary cause of cancer.
Many different risk factors, besides smoking, can increase the chances of having these genetic mutations. They include:
• exposure to radiation from tanning beds, the sun, or radiation therapy
• genetically inherited mutations or cancer-causing syndromes
• exposure to carcinogens in the environment or in products a person uses, such as some cleaning products or lead in old paint
• certain infections, especially chronic infections