Neurologic evaluation of taste and smell disorders.

Specific neurologic causes of chemosensory deficits are uncommon. A careful history and neurologic examination and the use of appropriate neurodiagnostic studies will identify the underlying cause in many cases and allow for appropriate management. The neurologic evaluation of the patient with abnormalities of smell, taste, or both is reviewed with specific reference to the disorders of the central and peripheral nervous system that may be causative.