Malignant illnesses on the other hand are the ones that can cause major complications and eventual death of a patient unless successfully treated. Cancer can develop in any body organ or tissue, with the exception of hair and nails. Most common cancers are Lung , Breast , Colon and Prostate cancers. Development and progress of a cancer takes place over a very long period of time. It may be years, from the time an error in a cell happens, until a patient would develop signs of cancer.
Cancers have a tendency to spread to other tissues and organs.
For example, a cancer that develops in the lung, can spread to the bones or to the brain . This process is called Metastasis , and normally takes place in most cancer. Cancer cells have very complex abilities, one of which is their ability to find their ways to blood stream. Once in blood stream, they can travel to almost every part of the body. Cancer is a very common problem in the world.