Cancer is an abnormal growth of cells that are not controlled by the body's hormones and can hamper other body systems. It causes 20% of deaths worldwide with increasing incidence due to improved detection. Cancer can be hereditary, caused by tobacco, alcohol, obesity, viruses, or pollution. Adopting a healthy lifestyle by quitting smoking, eating more fruits and vegetables, drinking green tea and water, and regular checkups can help prevent cancer. Early detection through screening is important for proper management as cancer is curable if detected early and treated promptly.