Heavy drinking of alcoholic beverages is also known to induce cancer of the mouth, esophagus , pancreas , or liver . Noticeable variations in cancer risk associated with reproductive history are largely statistical, with actual causes unexplained. Women who have had children have a lower risk of ovarian cancer, for example, but the reason is unknown. The role of occupational exposure to chemicals in the causing of cancer receives a great deal of media attention, in part because workers who think their cancer is job-related tend to sue the companies involved. Dioxins have long been known to cause cancer in animals, for example, but good evidence that these chemicals, which contaminate pesticides and are produced by burning, cause cancer in humans is hard to find.
Farmers have higher cancer rates than the rest of the population, and pesticides are suspected.
Other chemicals used in such industries as manufacturing computer chips are suspect as well. Farmers are among the persons with high rates of melanoma . This deadly cancer seems to occur most often in people who are exposed to ultraviolet radiation from the sun. Environment and disease,Radiation Radiation from X rays or radioactive elements is so powerful a cause of cancer that most workers with heavy exposure to radiation developed the disease. Steps are taken today to reduce exposure to X rays and other obvious sources of radioactive elements.