Cancer Causes

The abnormal growth of cells in parts of the body is what is defined as cancer. The brain, the lungs and even the breasts may all be affected by cancer. The article will deal with the likely causes of two dissimilar types of cancer and their probable causes. While all cancers share heredity as a major causal factor, there are other different causes of cancer which depend on the type of cancer.
The causes of cancer are unknown. However, heredity is one major cause of cancer. It is well known in the medical profession that incidences of cancer in the family place one at a higher risk of suffering from the same. This is true for most cancers. Examples of cancers that are hereditary are brain and ovarian cancer. Another major cause of cancer is prior history. Survivors of cancer are more at risk of developing the cancer again. But, there are certain other factors that are the causes of different types of cancers. These factors may be related to the external environment of the victims.
Two major factors also cause cancer. These are air pollution and smoking. Other cancer causing factors include sunlight and radiation. While there are many cancer forms, lung cancer due to smoking, is the most common in the United States. Cigarette smoking results in 90% of all the lung cancer reported cases in the US. Active smokers are the main victims. Even so, there is a 24% chance of passive smokers to develop lung cancer. Air pollution accounts for 1% of the lung cancer related cases. In this case the causes of lung cancer are exposure to pollution from vehicles, power plants and industries.
The victims personal situation and the cancer causes may be linked. For instance, a probable cause of cancer especially in women is hormones. Women who begin their menstruation much earlier and also those who enter menopause much later are at the greatest risk of developing breast cancer. Along with this, is the use of hormone replacement therapy especially by women after menopause which is also a possible cause of breast cancer. Though birth control pills are also said to result in breast cancer, there is no fool proof indication.
Causes of cancer are two pronged. These are prior history with the disease and heredity. Different forms of cancer have distinct causes. Hormones, use of hormone replacement therapy and the use of birth control pills are factors associated with the development of breast cancer. On the other hand, smoking and air pollution are said to be the likely lung cancer causes.