Hallucinations involve sensing things while awake that appear to
be real, but instead have been created by the mind. Common
hallucinations include: In some cases, hallucinations may be
normal. For example, hearing the voice of, or briefly seeing, a
loved one who has recently died can be a part of the grieving
process. There are many causes of hallucinations, including:
Freudenriech O, Weiss AP, Goff DC. Psychosis and schizophrenia.
In: Stern TA, Rosenbaum JF, Fava M, Biederman J, Rauch SL, eds.
Massachusetts General Hospital Comprehensive Clinical
Psychiatry. 1st ed. Philadelphia, Pa: Mosby Elsevier; 2008:chap
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