Phantosmia

Phantosmia is a form of olfactory hallucination. While most olfactory hallucinations are caused by a misinterpretation of a physical stimulus, such as in the case of parosmia, phantosmia is the perception of a smell in the absence of any physical odors. The odor can range from pleasant to a disgusting smell. Although the causes of phantosmia are debated, it is often comorbid with psychological disorders such as schizophrenia, mood disorders, Parkinsons disease, epilepsy, neuroblastoma, and frequent migraines.