How do people develop stage 4 cancer Cancer is a quiet killer, and many people are unaware of the warning signs until it's too late. It's easy to skip straight to stage 4 without realizing it. The carcinogens in cigarettes cause DNA changes, which are then triggered by other factors such as diet, UV exposure from the sun, and a lifetime of drinking. Eating processed foods filled with "pink slime" (cancer-friendly ingredients) combined with a lack of exercise can lead to people developing stage 4 cancer without symptoms or attributing their ailments to aging. The more a person's lifetime exposure to carcinogens, the more likely they are to acquire late-stage malignancies. More energy is produced as a result of increased activity, which implies more cells are generated to produce energy. More cells equals more potential for mutations, which equals cancer. Doctors recommend being checked at least once, and if required, twice each year in most cases of stage 4 cance...