Factors - the causes of cancer

Cause of cancer usually can not be known for certain because the causes of cancer can be a combination of a set of factors, genetic and environmental. However there are several factors that allegedly increase the risk of cancer, as follows:

    * Factor descent

      Genetic factors cause some families are at higher risk for certain cancers when compared with other families. Type of cancer that tends to run in the family is breast cancer, ovarian cancer, skin cancer and colon cancer. For example, the cancer risk for women increased 1.5 s / d 3 times if his mother or sister had breast cancer.

    * Environmental Factors

      - Smoking cigarettes increases the risk of lung cancer - lung, mouth, larynx (vocal cords), and bladder.
      - Ultraviolet rays from the sun
      - Ionizing radiation (which is carcinogenic) is used in x-ray beam generated from nuclear power plants and atomic bombs that can reach very long distances. For example, people who survived the atomic bombs on Hiroshima and Nagasaki in World War II, a high risk of cancer of blood cells, such as leukemia.

    * Factor Foods that contain chemicals.

      Food can also be an important risk factor for other causes of cancer, particularly cancers of the digestive tract. Examples of foods that can cause cancer are:
      - Foods that are smoked and pickled (in the form of pickles) increase the risk of gastric cancer
      - Drinks that contain alcohol cause a higher risk of esophageal cancer.
      - Food coloring
      - Heavy metals like mercury are often found in contaminated seafood such as shellfish, fish, etc..
      - Various food (sweet, white flour) that are processed in excess.

    * Virus

      Viruses can and suspected of causing cancer, among others:
      - Papilloma virus causes genital warts (genital) is one likely cause of cervical cancer in women.
      - Cytomegalovirus causes Kaposi's sarcoma (cancer of blood vessel system which is characterized by red skin lesions)
      - Hepatitis B virus can cause liver cancer.
      - Virus Epstein - Bar (in Africa) causes Burkitt's lymphoma, whereas in China these viruses cause cancer of the nose and throat. This occurs because of environmental and genetic factors.
      - Retro Virus in humans such as the HIV virus causes lymphomas and other blood cancers.

    * Infection

      - Parasite Schistosoma (bilharzia) could cause bladder cancer due to chronic irritation of the bladder. However, other chronic irritants do not cause cancer.
      - Infection by Clonorchis that cause pancreatic and bile duct cancer.
      - Helicobacter Pylori is a bacteria that may be the cause of gastric cancer, and presumably this bacterium causes gastric injury and chronic inflammation resulting in increased speed of the cell cycle.

    * Factor behavior

      - The behavior in question is smoking and eating foods that contain lots of fat and meat are preserved also drinkers of alcoholic beverages.
      - Behavior that is sexual intercourse diusia early and frequent dressing changes couples.

    * Disruption of hormonal balance

      The hormone estrogen stimulates cell growth function which tends to encourage the occurrence of cancer, while progesterone protects the occurrence of excessive cell growth. - There is a tendency that excess hormones estrogen and progesterone deficiency causes an increased risk of breast cancer, cervical cancer, cervical cancer and cancers of the prostate and testicles in men.

    * Psychological factors, emotional

      - Stress can cause severe cellular ganggguan balance the body. Continuous state of tension can affect the cells, where cells become hyperactive and changed the nature of a malignant cancer causing.

    * Free radicals

      - A free radical is an atom, group of atoms, or molecules that have unpaired electron dilingkaran free exterior. Source - a source of free radicals, namely:
      1. Free radicals are formed as a byproduct of metabolism.
      2. Free radicals enter the body in the form of chemical toxins from food, drinks, polluted air, and ultraviolet rays from the sun.
      3. Excessive free radicals are produced when we eat too much (impact on the process of metabolism) or when we are in a state of excessive stress, whether physical stress, psychological, or biological.