The cause of cancer is usually not known with certainty, because the causes of cancer can be a combination of a number of factors, genetic and environmental factors. But there are several factors that supposedly increases the risk of cancer, as follows:Heredity
Genetic factors cause some families have a higher risk of developing certain cancers compared to other families. The type of cancer tends to run in families, breast cancer, ovarian cancer, skin cancer and colon cancer. For example, an increased risk of cancer of a woman 1.5 s / d 3 times if the mother or sister had breast cancer.
Environmental Factors
Smoking increases the risk of developing lung cancer - lung, mouth, larynx (vocal cords), and bladder.
Ultraviolet light from the sun
Ionizing radiation (which is carcinogenic) is used in X-rays from nuclear power plants and nuclear bombs that could reach a great distance. For example. People who survived the atomic bombs on Hiroshima and Nagasaki in World War II, the high risk of developing cancer of blood cells such as leukemia
Foods containing chemical factors.
Food can also be another important risk factor for cancer, particularly cancers of the digestive tract. 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 a higher risk of esophageal cancer.
- Substance of food coloring
- Heavy metals such as mercury are often found in contaminated shellfish such as mussels, fish, etc..
- A variety of foods (fresh, flour) are treated too.
Virus, Viruses that can and suspected of causing cancer, including:
- Papilloma virus causes genital warts (genital) is probably a cause of cervical cancer in women.
- Cytomegalovirus causes Kaposi's sarcoma (cancer of the blood vessel system is characterized by red skin lesions)
- The hepatitis B virus can cause liver cancer.
- Epstein - Bar (in Africa), causes Burkitt's lymphoma, whereas in China these viruses cause cancer of the nose and throat. This occurs due to genetic and environmental factors.
- Retro-viruses in humans, such as the HIV virus causes lymphomas and other blood cancers.
Infection
- The parasite Schistosoma (schistosomiasis) can cause cancer of the bladder due to chronic irritation of the bladder. However, other chronic irritants do not cause cancer.
- Clonorchis infection that causes cancer of the pancreas and biliary tract.
- Helicobacter pylori is a bacterium that can cause gastric cancer, and the alleged injury, and this bacterium causes chronic inflammation of the stomach to increase the speed of the cell cycle.
Behavioral factors
- Response to smoking and eating foods that contain lots of fat and meat are also alcoholic beverages.
- A behavior that is age sex early and frequently change sexual partners.
Hormonal balance disorders
Estrogen stimulates the activity of the cells tends to encourage the presence of cancer, while progesterone protects the occurrence of an excessive growth of cells. - It 'habit that too much estrogen and progesterone deficiency leads to increased risk of breast cancer, cervical cancer, uterine cancer and cancer of the prostate and testicles in men.
Psychological factors, emotional
Stress can cause serious disruption to the company the balance of the cell body. Continuous state of tension that may affect the cells, where cells become overactive and the changing nature of malignant disease that cause.
Free radicals
Free radical is an atom, group of atoms or molecules that have unpaired electrons that are free of charge cyrcle off. Sources of free radicals, which are:
- Free radicals are formed as byproducts of metabolic processes.
- Free radicals enter the body in the form of chemical toxins in food, drink, smoke, and the sun's ultraviolet rays.
- Excessive production of free radicals when we eat too much (it seems the metabolism), or when we have a state of excessive stress, whether physical stress, psychological or biological.
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