Cancer is the name given to all related diseases. In all types of cancer, some of the body cells begin to divide continuously and spread to surrounding tissues. Cancer can start in almost any part of the human body, which is made up of trillions of cells. Normally, human cells grow and multiply to form new cells as the body needs them. When cells become old or damaged, they die and new cells replace the dead cells. However, when cancer develops, this orderly process is disrupted. As cells become increasingly abnormal, old or damaged cells survive when they should die, and new cells emerge even when they are not needed. These extra cells can divide constantly and form lumps called tumors. Many cancers form solid tumors that are masses of tissue. Leukemia-like blood cancers do not usually form solid tumors. Cancerous tumors are malignant, which means they can spread or invade nearby tissues. Additionally, as these tumors grow, some cancer cells can break off and travel to distant locations in the body through the blood or lymph system, forming new tumors far from the original tumor.
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