The world of a schizophrenic individual may be filled with hallucinations; a person actually may sense things that do not exist in reality, such as hearing voices telling the person to do certain things, seeing people or objects that are not really there, or feeling invisible fingers touching his or her body. These hallucinations may be quite frightening. Hearing voices that other people donít hear is the most common type of hallucination in schizophrenia. Such voices may describe the patientís activities, carry on a conversation, warn of impending dangers, or tell the person what to do.
Hallucinations may also occur because of use or abuse of a variety of substances including alcohol, marijuana, PCP (phencyclidine), LSD (lysergic acid diethylamide), Ecstasy, mushrooms, stimulants, cocaine, and even caffeine. (See Substance Abuse).
Hallucinations may also occur due to Bipolar Disorder, Delirium or Dementia

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