Everybody knows that there are many causes for cancer because it is a complex and multifactorial disease, due to many factors can provoke cancer. Theses causes can be classified into internal and external ones. The external causes are substances which can increase the risk to generate tumours, they are called carcinogenic and they can be physical, chemical and biological.
The typical factors that generate cancer are tobacco, alcohol, sunbathing and unhealthy food. They are external factors that can be modified. On the contrary, the internal factors cannot be modified, and they are age, sex, race and family history or genetic predisposition. However, these factors must be known to plan a suitable strategy to prevent at the first place and treat secondly through medical check-ups and a change to a healthier lifestyle.
Let’s see the cancer incidence according to certain parameters.