How do people get cancer?

Multifactorial: It is believed that cancer comes about when the normal growth patterns of cells becomes abberant and there is thus rapid proliferation of the cells. This displaces the normal tissues. What triggers this uncontrolled growth is unknown. There are numerous associations that have been clearly shown to predispose one to cancer. For example, smoking, exposure to radiation, exposure to certain chemicals.

Cancer Causes: Doctors often cannot explain why one person develops cancer and another does not. But research shows that certain risk factors increase the chance that a person will develop cancer. These are the most common risk factors for cancer: growing older, tobacco, sunlight, ionizing radiation, certain chemicals and other substances, some viruses and bacteria, certain hormones, family history of cancer, .