Olfactory Hallucination

An olfactory hallucination is the illusion of smelling something that is not present in the environment. Also known as phantosmia, it can occur as the result of a misperception of a physical stimulus that may be related to neurological and psychological disorders such as schizophrenia, mood disorders, Parkinson's disease, epilepsy, neuroblastoma, and frequent migraines. Typically the phantom scents are unpleasant such as the smell of something rotting.