Also known as bodily hallucinated smell. The term intrinsic olfactory hallucination is indebted to the Latin words intrinsecus (within, on the inside) and ol(e)facere (to smell). It was introduced in or shortly before 1971 by the Canadian neurologist William E.M. Pryse-Phillips to denote an "olfactory hallucination (i.e. a hallucination of smell) which the affected individual believes to be emanating from his or her own body, without the intervention of any outside agency. The term " olfactory reference syndrome is used when there is no insight into the hallucinatory nature of the foul odour, and the affected individual develops delusions of reference on the basis of this symptom. The term intrinsic olfactory hallucination is used in opposition to "extrinsic olfactory hallucination (i.e. an olfactory hallucination attributed to an extracor-poreal source).
References
Pryse-Phillips, W. (1971). An olfactory reference syndrome. Acta Psychiatrica Scandinavica, 47, 484-509.
Dictionary of Hallucinations. J.D. Blom. 2010.