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Tobacco is the major cause and reason of Cancer. Approximately, 22% of death caused by Tobacco. About 10% are coz of obesity, poor-diet, lack of physical activity, excessive intake of alcohol, substance-use or addiction. Other factors include certain infections, exposure to ionizing radiation, and environmental pollutants. In the developing world, 15% of cancers are coz of infections such as Helicobacter pylori, hepatitis-B, hepatitis-C, human papillomavirus infection, Epstein-Barr virus and human immunodeficiency virus (HIV).
Approximately, 5% - 10% of cancers are due to inherits genetic defects. Cancer can be detected by certain Signs and Symptoms or screening tests. It is then typically further investigated by medical imaging, and confirmed by biopsy.