Smell and taste disorders

Overview

The loss of the senses of smell (anosmia) and taste (ageusia) are the most common chemosensory disorders.

The reduced ability to smell (hyposmia) or to taste sweet, sour, bitter, or salty substances (hypogeusia) are also common.

In other disorders of the chemosenses, odors, tastes, or flavors may be misread or distorted, causing a person to detect an unpleasant odor or taste from something that is normally pleasant to taste or smell. These disorders are important because they can have a significant impact on quality of life and be a sign of underlying disease.  

Smell disorders are serious because they damage the early warning system that can alert a person to such things as:

  • Fire

  • Poisonous fumes

  • Leaking gas

  • Spoiled food and beverages

Abnormalities in taste and smell can accompany or indicate the existence of diseases or conditions, such as:

  • Obesity

  • Diabetes

  • Hypertension

  • Malnutrition

  • Degenerative diseases of the nervous system, such as:

    • Parkinson's disease

    • Alzheimer's disease

    • Multiple sclerosis

Causes

Although some people are born with chemosensory disorders, most are caused by:

  • Illness (for example, upper respiratory infection, sinus infection, and allergies)

  • Injury to the head

  • Hormonal disturbances

  • Dental. oral, or perioral problems

  • Nasal polyps

  • Exposure to certain chemicals

  • Certain medications

  • Exposure to radiation therapy for head or neck cancer

  • Over-the-counter and prescription medications 

  • Intranasal cocaine

  • Cigarette smoking

Diagnosis

In addition to a complete medical history and physical examination, diagnostic procedures may include:

  • Measuring the lowest concentration of a chemical that a person can recognize

  • Comparing tastes and smells of different chemicals

  • "Scratch and sniff" tests

  • "Sip, spit, and rinse" tests where chemicals are directly applied to specific areas of the tongue

Treatment

Specific treatment for smell and taste disorders will be determined by your doctor based on:

  • Your age, overall health, and medical history

  • Extent of the disorder

  • Your tolerance for specific medications, procedures, or therapies

  • Expectations for the course of the disorder

  • Your opinion or preference

Treatment may include:

  • Stopping or changing medications that contribute to the disorder

  • Correction of the medical problem that is causing the disorder

  • Surgical removal of obstructions that may be causing the disorder

  • Counseling

  • Smoking cessation

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