What are the causes of cancer?
Leading risk factors for preventable cancers are smoking, getting too much ultraviolet (UV) radiation from the sun or tanning beds, being overweight or having obesity, and drinking too much alcohol.
- Genetics: Cancer syndromes (Ataxia–telangiectasia, Bloom syndrome, BRCA1 & BRCA2, Fanconi anemia, Familial adenomatous polyposis, Hereditary breast and ovarian cancer, Hereditary nonpolyposis colorectal cancer, Li–Fraumeni syndrome, Nevoid basal-cell carcinoma syndrome, Von Hippel–Lindau disease, Werner syndrome, Xeroderma pigmentosum).
- Physical and chemical agents: Smoking, materials like arsenic, asbestos, benzene, beryllium, cadmium, chromium, ethylene oxide, nickel, plutonium.
- Lifestyle: Alcohol, diet, obesity.
- Infection and inflammation: viruses, bacteria and parasites, inflammation.
- Radiation: non-ionizing radiation, ionizing radiation.
- Rare causes: organ transplantation, trauma, maternal-fetal transmission.