What Is Cancer?
Cancer is a disease in which cells grow uncontrollably and are not able to die. In the human body, there are many types of cells that make up the different tissues, organs, and systems. These cells grow and divide to form new healthy cells as needed by the body. But when cancer starts, these healthy new cells start to grow out of control and can form lumps or masses called tumors. Cancer is an uncontrolled growth of abnormal cells in a part of the body such as the breast or lung.
The cancerous tumors can invade nearby tissue or spread through the bloodstream and lymphatic system to other parts of the body such as your liver, brain, or bone marrow.