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Cancer occurs when genetic mutations in abnormal cells cause them to divide rapidly. You can inherit mutations or develop them due to environmental factors. What is cancer? Cancer is a large group of diseases that occur when abnormal cells divide rapidly and can spread to other tissue and organs. These rapidly growing cells may cause tumors. They may also disrupt the body’s regular function. Cancer is one of the leading causes of death in the world. According to the World Health Organization (WHO)Trusted Source, cancer accounted for almost 1 in 6 deaths in 2020. Experts are working hard to test out new cancer treatments every day. What causes cancer? The main cause of cancer is mutations, or changes to the DNA in your cells. Genetic mutations can be inherited. They can also occur after birth as a result of environmental forces. These external causes, called carcinogens, can include: physical carcinogens like radiation and ultraviolet (UV) light chemical carcinogens like cigarette...