Anosmia causes

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Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]

Overview

A temporary loss of smell can be caused by a stuffy nose or infection. In contrast, a permanent loss of smell may be caused by death of olfactory receptor neurons in the nose, or by brain injury in which there is damage to the olfactory nerve or damage to brain areas that process smell (see olfactory system). The lack of the sense of smell at birth, usually due to genetic factors, is referred as congenital anosmia. Anosmia may very occasionally be an early sign of degenerative brain diseases such as Parkinson's disease and Alzheimer's disease.

Common Causes

• Allergies

• Common cold

• Infection

• Nasal polyp

• Old age

• Sinusitis

• Stuffy nose

• Trauma

Causes by Organ System

Cardiovascular	No underlying causes
Chemical / poisoning	Acrylates, Cadmium Poisoning
Dermatologic	No underlying causes
Drug Side Effect	No underlying causes
Ear Nose Throat	Common cold
Endocrine	Cystic Fibrosis
Environmental	No underlying causes
Gastroenterologic	Cystic Fibrosis
Genetic	Anosmin-1 absence, Anosmin-1 damage, Bardet-Biedl syndrome, Cystic Fibrosis
Hematologic	No underlying causes
Iatrogenic	No underlying causes
Infectious Disease	No underlying causes
Musculoskeletal / Ortho	No underlying causes
Neurologic	Alzheimer's disease, Brain injury, Degenerative brain diseases, Dementia with Lewy bodies
Nutritional / Metabolic	No underlying causes
Obstetric/Gynecologic	No underlying causes
Oncologic	No underlying causes
Opthalmologic	No underlying causes
Overdose / Toxicity	No underlying causes
Psychiatric	No underlying causes
Pulmonary	No underlying causes
Renal / Electrolyte	No underlying causes
Rheum / Immune / Allergy	Allergies
Sexual	No underlying causes
Trauma	No underlying causes
Urologic	No underlying causes
Dental	No underlying causes
Miscellaneous	No underlying causes