Hallucinations can have various causes, just like most other symptoms. Finding the true cause means ruling out or confirming each possibility – in other words, diagnosis.
Diagnosis is usually a complex process due to the sheer number of possible causes and related symptoms. In order to diagnose hallucinations, we could:
Do you suffer from hallucinations?
Possible responses:→ Don't know
→ Occasional minor hallucinations
→ Frequent minor hallucinations / occasional severe
→ Frequent severe hallucinations
Extreme deficiency may produce hallucinations or delirium.