Nepedia
Back to Discover
Advanced Reader
🧬

Ageusia

life science Maturity 11-13 Next article →

Ageusia is the complete loss of the sense of taste. The term comes from the Greek word *geûsis*, which means taste. People with ageusia cannot detect sweetness, sourness, bitterness, or saltiness. They also lose the ability to sense umami, which is a savory flavor. This condition is different from anosmia, which is the loss of smell. Ageusia is much rarer than hypogeusia, a partial loss of taste. It is also rarer than dysgeusia, which is a distortion of taste.

Many different factors can cause a person to lose their sense of taste. Some issues involve the water-soluble molecules that allow us to taste. If the mouth becomes too dry, these molecules cannot function. Damage to the taste buds can also cause ageusia. Medical treatments like radiation therapy might lead to this loss. Physical injuries to the head, jaw, or middle ear are also causes. In some cases, ageusia is caused by nerve damage following surgery.

Illness and medication are other common causes of taste loss. Infections like the common cold, influenza, and strep throat can affect taste. Salivary gland infections or sinusitis are also possible causes. Some medications, such as chemotherapy or anti-seizure drugs, may cause ageusia. Even blood pressure medications or anti-depressants can have this effect. Certain diseases like epilepsy, stroke, or multiple sclerosis may also be responsible. For those with diabetes, fluctuating glucose levels can disrupt the taste buds.

Recent years have seen an increase in reported cases due to COVID-19. The virus can cause both ageusia and anosmia. These symptoms might last for as long as four weeks. Research suggests a link between taste cells and ACE2 receptors. A higher number of these receptors may provide an easy route for infection. The virus might also change the amount of saliva in the mouth. A lack of saliva can eventually damage the cells on the tongue's surface.

Studies show how different regions were impacted by COVID-19 taste disorders. In North America, 61.0% of patients reported these issues. In Europe, the number reached 55.2%. Other areas like South America saw 29.5% of patients affected. Australia reported 25.0%, and Asia reported 27.1%. In one European study, 88% of 400 patients reported gustatory or olfactory dysfunction. However, in South Korea, only 30% of 2,000 cases showed ageusia.

An otolaryngologist, or ENT doctor, usually diagnoses ageusia. They examine the head, nose, ears, and mouth to find the cause. They may use imaging to look for tumors or injuries. One way to measure severity is through electrogustometry. This test applies mild electric currents to specific parts of the tongue. Another method is a suprathreshold taste test. This involves using an edible strip that contains various flavors. The doctor checks which flavors the patient can still recognize.

Losing taste can lead to significant lifestyle complications. It often diminishes the enjoyment of eating. This can lead to social withdrawal, isolation, or feelings of depression. Some people may develop unhealthy eating habits. They might eat too little or consume too much sweet or sour food. This is especially risky for people with diabetes. Treatment often depends on the cause. If a medication caused it, a doctor might suggest a different one. Antibiotics or decongestants may help if an infection is the cause.

548 words

Where will your curiosity go next?

Keep exploring at your chosen reading level.

More to explore

✨ What else?

Related topics you might enjoy

🔬 Go deeper

More advanced topics to explore

🪜 Step back

Simpler topics to build understanding

What is Nepedia?

A free, ad-free encyclopedia for children. Every article is written at five reading levels, so the same page works for a five-year-old and a fifteen-year-old — use the level switcher above to see this one change. No account needed to read.