Cause cancer is usually not known for certain because the causes of cancer can be a combination of a set of factors, genetic and environmental. But there are several factors that allegedly increase the risk of cancer, as follows:
* Factor offspring genetic factors cause some families have a higher risk for certain cancers when compared with other families. Type of cancer in the family is likely inherited breast cancer, ovarian cancer, skin cancer and colon cancer. For example, the risk for women suffering from cancer increased 1.5 s / d 3 times if his mother or sister had breast cancer.
* Environmental Factors - Cigarette smoking increases the risk of lung cancer - lung, mouth, larynx (vocal cords), and bladder tract. - Ultraviolet light from the sun - ionizing radiation (which is carcinogenic) is used in x-ray beam generated from nuclear power plants and atomic bombs that could reach a great distance. For example, people who survived the atomic bomb on Hiroshima and Nagasaki in World War II, a high risk of blood cell cancers, like leukemia.
* Factor Foods that contain chemicals. Food also can be an important risk factor for other causes of cancer, particularly cancers of the channel digestion. Examples of foods that can cause cancer are: - smoked and pickled foods (in the form of pickles) increase the risk of gastric cancer - Drinks that contain alcohol cause higher risk for esophageal cancer. - Food coloring - Heavy metals like mercury are often found on contaminated seafood such as shellfish, fish, etc.. - A variety of food (sweet, flour), which processed in excess.
* Virus and suspected virus that can cause cancer, among others: - Papilloma virus causes genital warts (genital) seems an one cause of cervical cancer in women. - cytomegalovirus causes Kaposi's sarcoma (cancer of the blood vessel system which is characterized by red skin lesions) - Virus Hepatitis B 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 lymphoma and other blood cancers.
* Infection - Parasite Schistosoma (bilharzia) may cause bladder cancer due to chronic irritation of the bladder. However, other chronic irritants do not cause cancer. - Infection by Clonorchis that cause pancreatic cancer and biliary tract. - Helicobacter pylori is a bacterium that may be the cause of gastric cancer, and allegedly this bacterium causes gastric injury and chronic inflammation resulting in increased speed of cell cycle
* Factor behavior - 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 early age and frequently changing sexual partners.
* Impaired hormonal balance hormone estrogen stimulates the growth function cells that tend to encourage the occurrence of cancer, while progesterone protects the occurrence of excessive cell growth. - There is a tendency that the excess hormones estrogen and progesterone deficiency cause increased risk of breast cancer, cervical cancer, uterine cancer and cancer of the prostate and testicles in men.
* Psychological factors, emotional - that severe stress can cause the body's cellular balance.
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