Sudden onset of hallucinations in a 35 year old man with no previous history & family history of schizophrenia may be due to -

This patient has - Sudden onset of hallucination Previous history negative (Patient was normal before onset of hallucination) Relevant family history In Schizophrenia, Sudden onset of hallucination may be the first symptom and patient may have a positive family history. About other options In depression, there should be a history of depressive symptoms before the onset of hallucination. In substance abuse, there should be a history of substance abuse.