During the process of cell division -- the basis of normal body growth and repair -- cells become differentiated into the specific kinds needed for each organ or body function.  Each kind of cell divides into its own kind, equipped to do the job it was designed to do.  Under certain conditions not yet completely understood, some cells do not differentiate in this way.  They multiply in irregular and disorderly fashion and compete with normal cells for nutrition and space.  These cell masses are called tumors.  Benign tumors that remain localized may not be troublesome unless they mechanically interfere with some body function.  Malignant tumors that grow rapidly and spread or destroy tissue are collectively called cancer.  This unrestrained growth of abnormal or undifferentiated cells will infiltrate vital organs and destroy the individual if not checked.  Since most cancers cannot be prevented, it becomes necessary to detect them early while prompt treatment can still control them.  A thorough physical examination every year is essential.  Equally helpful is to know and heed the American Cancer Society's Seven Danger Signals:

1) Unusual bleeding or discharge.
2) A lump or thickening in the breast or elsewhere.
3) A sore throat that does not heal.
4) Change in bowel or bladder habits.
5) Hoarseness or cough.
6) Indigestion or difficulty in swallowing.
7) Change in wart or mole.

If any one of these symptoms persists for longer than two weeks, see your doctor immediately.
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