Cancer has multiple causes.
Environmental Factors: Environmental factors are ordinarily view to be responsible for 80% to 90% of all human cancers. The major environmental factors identified so far include:
Stomach Cancer
Tobacco: Tobacco in assorted forms of its usage (e.g., smoking, chewing) is the major environmental cause of cancers of the lung, larynx, mouth, pharynx, esophagus, bladder, pancreas and probably kidney. It has been estimated that, cigarette smoking is responsible for more than one million premature deaths each year.
Alcohol: excessive intake of alcoholic beverage leads to esophageal and liver cancer. Beer consumption may be connected with rectal cancer.
Dietary Factors: Smoked fish is connected to stomach cancer, dietary fiber to intestinal cancer, beef consumption to bowel cancer, and a high fat diet to breast cancer. Food additives are also some causative agents.
Occupational Exposures: These comprise exposure to benzene, arsenic, vinyl chloride, asbestos, polycyclic hydrocarbons etc. (e)
Viruses: Hepatitis B and C virus is reported to be connected to hepatocellular carcinoma. Human papilloma virus (Hpv) is connected with cancer cervix.
Habits And Life Style: Habits and lifestyle of people may be connected with an increased risk of inescapable cancers. Some examples are the established connection in the middle of smoking and lung cancer, betel chewing and oral cancer, etc. There are any other environmental factors such as sun light, radiation, air and water pollution, pesticides which can cause cancer.
Genetic Factors: Genetic influences have long been suspected. For example, retinoblastoma occurs in the children of the same parent. The Mongol race is more likely to invent cancer (leukemia) than normal children. However, genetic factors are less conspicuous and more difficult to identify.
The Top 8 Causes of Cancer
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