Abstract
Hallucinations are an abnormality in sensory perception in which the individual has an experience without an external stimulus that provokes it. It may occur in normal individuals in the transition from sleep to waking or in situations of sensory deprivation or sleep. Other frequent causes are Charles Bonnet syndrome in individuals with severe sensory deficiencies. The causes of hallucinations may vary greatly, from the intake of drugs or pharmaceuticals to confusional syndrome to various neurological and/or psychiatric diseases. In the case of neurodegenerative diseases, they are very common in Parkinson's disease, Lewy body dementia, and Alzheimer's disease.It is necessary to make a good differential diagnosis, reviewing the aforementioned causes one by one, although on occasion this may not be easy, especially when they occur in older adult patients with baseline cognitive impairment who may begin having late-onset psychosis.
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