Six factors are considered as the most important causes of cancers.
Several causes have been identified so far behind the development of Cancers. The causes of cancer can occur due to different factors.
The substance like tobacco smoking is a major cause of cancer and is associated with many forms of cancer. Tobacco smoking causes about 90% of lung cancer. Having prolonged exposure to asbestos fibres can cause mesothelioma or carcinoma.
Though, many mutagens can be called as carcinogens, some carcinogens may not act like mutagens. Alcohol is a chemical carcinogen, but not a mutagen. This type of chemicals can promote cancers, by stimulating the rate of cell division.
Tobacco use is also linked with cancers in other organs like larynx, head, neck, stomach, bladder, kidney, oesophagus and pancreas. Tobacco is responsible for about one in five of all cancer deaths worldwide.
Viral or bacterial infection can cause cancers. A few types of cancers are caused by infection with pathogens. There are also many other cancers that originate from a viral infection.
Another cause behind developing cancer is hormonal imbalances. Some hormones in human body can sometimes act in a similar manner to non-mutagenic carcinogens. In this way, they may stimulate excessive cell growth.Read More :- Causes of Cancer
