Cancer is caused by various factors like Tobacco, viral infections, chemical and radiation exposure, occupational exposures like asbestos and dyeing industries and genetic inheritance.

Some of these risk factors can be controlled. For example banning tobacco, protection against viral infections, healthy lifestyle behavior and Safe occupational health practices etc can help control the risk of Cancer. Certain other factors like hereditary factors, natural exposure to radiation etc cannot be controlled but can be modified with appropriate health care.