Preventive oncology is the branch of medical science that focuses on preventing the development of cancer through early detection, lifestyle modification, and treatment of pre-cancerous conditions. Preventive oncology is a relatively new field of medicine, but it has become increasingly important in recent years as research has revealed more information about the causes and risk factors of various cancers. The primary goals of preventive oncology are to reduce the incidence of cancer and to detect it as early as possible. These goals are achieved through lifestyle modification, the use of cancer screening tests, and the early treatment of pre-cancerous conditions. Lifestyle modifications are changes that an individual can make to their daily routine to reduce the risk of developing cancer. These modifications include eating a healthy diet, exercising regularly, avoiding smoking and alcohol use, and limiting sun exposure. Cancer screening tests are tests that are used to detect cancer in its early stages. Common tests include mammograms, colonoscopies, Pap tests, and prostate-specific antigen (PSA) tests. Finally, the early treatment of pre-cancerous conditions is one of the most important aspects of preventive oncology.