Ijpsr (2009), Issue 1, Vol

Causes of Cancer: ^{13, 14}

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  There are many causes which may cause cancer in different body parts like mainly 22% deaths are due to tobacco consumption, 10% of deaths are due to poor diet, obesity, lack of physical activity, excessive drinking of alcohol or other facts include certain exposure to ionizing radiation, environmental pollutants, and infection.
  
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  About 15% of cancer in the world is due to some infections like hepatitis b, hepatitis c, human papillomavirus infection, helicobacter pylori, and immunodeficiency virus (HIV), Epstein - Barr virus. These factors are at least partly responsible for changing the genes.
  
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  Inherited genetic defects from patient’s parents are also responsible for 5-10% of cancer.
  
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  Cancer is caused by the interaction between genetic factors and 3 categories of agents which we consume externally including:
  

1. 
   Physical Carcinogens: Ionizing radiation such as radon, ultraviolet rays from sunlight, uranium, radiation from alpha, gamma, beta, and X-ray-emitting sources.
   
2. 
   Chemical Carcinogens: Compounds like n- nitrosamines, asbestos, cadmium, benzene, vinyl chloride, nickel, and benzidine and contains about 60 known potent cancer- causing toxins or chemicals in cigarette smoking or tobacco consumption, a drinking water contaminant (arsenic), a food contaminant (aflatoxin) ¹².
   
3. 
   Biological Carcinogens: Infections from certain bacteria, viruses, or parasites and Pathogens like human papillomavirus (HPV), EBV or Epstein-Barr virus, hepatitis B and C,
   

Kaposi’s sarcoma-associated herpesvirus (KSHV), Markel cell polyomavirus, Schistosoma spp., and Helicobacter pylori.
Aging is also the cause of cancer. Age is the common incidence of cancer, which dramatically rises.

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  Genetics: Genetic is the commonest cause for cancer or tumor-like Ovarian, breast, prostate, skin cancer, colorectal cancer. Individuals that eat heaps of cooked meat can also increase risk because of compounds fashioned at high temperatures. Proving that a substance doesn't cause or isn't associated with hyperbolic cancer risk is tough.