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Home >Information for Patients > Dictionary Index

Dictionary of Cancer Terms

View in Spanish: Alucinación

Hallucination (huh-LOO-sih-NAY-shun)
A sight, sound, smell, taste, or touch that a person believes to be real but is not real. Hallucinations can be caused by nervous system disease, certain drugs, or mental disorders.

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