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ID	SYMP:0000607
Name	hallucination
Definition	Hallucination is a general symptom where there is a perception of something (as a visual image or a sound) with no external cause usually arising from a disorder of the nervous system (as in delirium tremens or in functional psychosis without known neurological disease) or in response to drugs (as LSD). http://www2.merriam-webster.com/cgi-bin/mwmednlm?book=Medical&va=hallucinations
Xrefs	UMLS_CUI:C0018524
Parent Relationships	is_a general symptom
Related Diseases	has symptom fatal familial insomnia paranoid schizophrenia alcoholic psychosis Lafora disease neurotic disorder delusional disorder pellagra