Cancer is a large group of diseases that can start in almost any organ or tissue of the body when abnormal cells grow uncontrollably, go beyond their usual boundaries to invade adjoining parts of the body and/or spread to other organs. The latter process is called metastasizing and is a major cause of death from cancer.
Between 30% and 50% of cancer deaths could be prevented by modifying or avoiding key risk factors and implementing existing evidence-based prevention strategies. The cancer burden can also be reduced through early detection of cancer and management of patients who develop cancer. Prevention also offers the most cost-effective long-term strategy for the control of cancer.
Modifying or avoiding the following key risk factors can help prevent cancer:
- avoid tobacco use, including cigarettes and smokeless tobacco
- maintain a healthy weight
- eat a healthy diet with plenty of fruit and vegetables
- exercise regularly
- limit alcohol use
- practice safe sex
- get vaccinated against hepatitis B and human papillomavirus (HPV)
- reduce exposure to ultraviolet radiation
- prevent unnecessary ionizing radiation exposure (e.g. minimize occupational exposure, ensure safe and appropriate medical use of radiation in diagnosis and treatment)
- avoid urban air pollution and indoor smoke from household use of solid fuels
- get regular medical care
- some chronic infections are also risk factors for cancer. People in low- and middle-income countries are more likely to develop cancer through chronic infections.
