Smelling something that isn’t present in the surrounding environment. Also known as phantosmia. Can be caused by seizures, brain injury, or psychiatric illnesses such as schizophrenia.
Example: The patient complains of an intensely foul odor, which nobody else in the room can detect. A few minutes later, the patient has a seizure.
Grinnell, R. (2011). Olfactory Hallucination. Psych Central. Retrieved on May 25, 2015, from http://psychcentral.com/encyclopedia/2008/olfactory-hallucination/