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Home >Information for Patients > Dictionary Index

Dictionary of Cancer Terms

View in Spanish: Fenómeno adverso

Adverse event (AD-vers eh-VENT)
An unexpected medical problem that happens during treatment with a drug or other therapy. Adverse events do not have to be caused by the drug or therapy, and they may be mild, moderate, or severe. Also called adverse effect.



 
 
Source: National Cancer Institute Dictionary of Cancer Terms, available at www.cancer.gov/dictionary.