Cancer is a group of many related diseases that begin in cells, the
body's basic unit of life. To understand Hodgkin's disease, it is
helpful to know about normal cells and what happens when they become
cancerous. The body is made up of many types of cells. Normally, cells
grow and divide to produce more cells only when the body needs them.
This orderly process helps keep the body healthy.
Sometimes cells
keep dividing when new cells are not needed, creating a mass of extra
tissue. This mass is called a growth or tumor. Tumors can be either
benign (not cancerous) or malignant (cancerous).
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