Cancer is a disease in which some of the body's cells divide too fast and don't develop to perform their normal function. They divide so quickly that they produce too much tissue and a malignant (cancerous) tumor develops. Cancers may metastasize--that is, spread--as the tumor grows. Cancer is spread w hen cells break off from the tumor and are carried to other parts of the body by the bloodstream or lymphatic system.
Click on the parts of the body to find out about the different types of cancers.