Hallucinations take place when someone sees hears feels tastes or even smells things that do not actually exist. This distorted sense of perception can be a very disorienting and scary experience for the patient and also his loved ones. Due to lack of awareness people who suffer from hallucinations are called crazy and deranged . If you know someone who has hallucinations it is important to realise that it is a symptom of an underlying health condition that needs to be diagnosed immediately. These are the eight possible causes of hallucinations everyone should be aware of. 1. Schizophrenia Schizophrenia is