A Part of the University of Maryland Medical Center

Connect with UMGCC
Facebook Twitter YouTube Blog iPhone
Email PageEmail page Print PagePrint page

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.