NCI Dictionary of Cancer Terms

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The NCI Dictionary of Cancer Terms features 7,899 terms related to cancer and medicine.

Browse the dictionary by selecting a letter of the alphabet or by entering a cancer-related word or phrase in the search box.

aggravating factor
(A-gruh-VAY-ting FAK-ter)
Something that makes a condition worse. For example, tobacco smoke is an aggravating factor for asthma.