Smell and Taste Disorders (Chemosensory Disorders)
What are smell and taste disorders?
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:
Spoiled food and beverages
Abnormalities in taste and smell can accompany or indicate the existence of diseases or conditions, such as:
Degenerative diseases of the nervous system, such as:
What causes smell and taste disorders?
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
Dental. oral, or perioral problems
Exposure to certain chemicals
Exposure to radiation therapy for head or neck cancer
Over-the-counter and prescription medications
How are smell and taste disorders diagnosed?
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 for smell and taste disorders
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