A hallucination is a perception of something that is not really there. A hallucination can involve any of the senses: hearing, sight, smell, taste, or touch.
The most common hallucinations are:
Other types of hallucinations include tasting something (gustatory hallucination), smelling something (olfactory hallucination), and feeling something that is not there (tactile hallucination).
Some people have hallucinations that are not considered symptoms of mental illness. They may occur when a person is about to fall asleep (hypnagogic hallucinations) or when a person is just waking up (hypnopompic hallucinations).
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