Cancer is a complex group of diseases with many possible causes.
In all types of cancer, some of the body’s cells begin to divide without stopping and spread into surrounding tissues.
Cancer can spread almost anywhere in the human body, which is made up of trillions of cells. In normal functioning human conditions, human cells grow and divide to form new cells as the body needs them. When cells grow old or become damaged, they die, and new cells take their place.
When cancer develops, however, this orderly process breaks down. As cells become more and more abnormal, old or damaged cells survive when they should die, and new cells form when they are not needed. These extra cells can divide without stopping and may form growths called tumors.
