Causes of Cancer
In majority of people cancer
occurs for no particular cause, respectively the cause remains unknown.
However, experts assume that transformation from normal into a cancer
cells takes place gradually, progressing from a pre-cancerous lesion to
malignant tumor. Such transformation is believed to be a result of interaction
between one's genetic factors and external factors which can be divided in
three categories :
1. physical carcinogens such as exposure to ultraviolet and ionizing
radiation
2. chemical carcinogens such as tobacco smoke, asbestos and benzene
3. and biological carcinogens such as viral and bacterial infections
(Human Papilloma Virus, Hepatitis B, HIV)
Factor which greatly increases the
risk of cancer is also aging because cancer most frequently affects
people older than 50 years. However, cancer can also occur in younger people
and even children, while both men and women are in equal risk. Malnutrition and
consumption of foods high in fats and low in fiber (fruits and vegetables), and
excessive alcohol consumption is also proven to increase the risk of some types
of cancer such as colorectal cancer.
About 20% of all cases of cancer is
caused by genetic factors - inherited genetic mutation. The inherited genetic
mutation is transfered from parents to children and thus the risk of cancer is
greater in families which have a history of cancer. However, inherited genetic
mutation does not necessarily mean that one will get cancer. If the risk is
high the doctors usually recommend regular testing with purpose that if cancer
does occur it can be detected and treated early. Risk of hereditary cancer have
people whose relatives have cancer and/or family member or relative has more than
one type of cancer.
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