Is Cancer Considered a Disease?

The National Cancer Institute states that cancer is a collection of diseases that arise from the overgrowth of mutated cells that invade various tissues in the body. The over 100 types of cancer are usually named for the cell or body part in which the mutated cells originate.

The National Cancer Institute notes that the main types of cancer are carcinoma, which originates in the skin or skins of organs; leukemia, which starts in blood forming tissues; lymphoma and myeloma, which originate in the immune system; central nervous system cancers, which begin in the brain and spinal cord; and sarcoma, which originates in bone and cartilage, fat, muscle, blood vessels, and other connective and supportive tissue.