A hallucination is an incorrect perception of a stimulus that does not exist. The individual receives information that is not real. It can be sensitive, linked to each of the five senses and so, auditory or visual, more rarely taste, touch, or smell, and sometimes involves several senses. There are also cenesthetic hallucinations, when a person, usually a woman, perceives touching or fondling, frequent hallucinations in paranoid psychosis. Hallucinations may be due to the consumption of medications or toxic substances, to a psychiatric illness as in certain psychoses, or to a neurological disease.