About hallucination

Hallucinations itself arises when the body produces too much hormone cortisol. The hormone is produced when a person experiences stress.
In General hallucinations associated with a disease called: Schizophrenia

* Schizophrenia is a brain disorder that affects all functional aspects.

* There is no single cause has been determined, but research shows that cause, among others, genetic, and structural changes in brain chemistry, and various factors related to stress.

* The symptoms may include hearing voices (hallucinations), a false belief (delusion), communicating in ways that are difficult to understand, as well as occupational and social functions that bad.

* The symptoms can be improved, but relapse can also keep for a lifetime.

source : kno-w.com