ageusia
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GC: n

S: MN – http://www.medicinenet.com/taste_disorders/article.htm (last access: 11 November 2016); MD – http://emedicine.medscape.com/article/861242-overview (last access: 11 November 2016).

N:1. Early 19th century; earliest use found in John Mason Good (1764–1827), physician and surgeon. From scientific Latin ageusia from a- + ancient Greek γεῦσις sense of taste + scientific Latin -ia.
2. Lack of sensitivity to taste stimuli.
3. Historically, disorders of taste and smell have been difficult to diagnose and treat, often because of a lack of knowledge and understanding of these senses and their disease states. An alteration in taste or smell may be a secondary process in various disease states, or it may be the primary symptom. Loss of smell and/or taste has been linked to inadequate nutritional intake, reduced social pleasure, and decreased psychological wellbeing. It may even be life threatening, impairing the detection of smoke in a fire or the ability to identify spoiled food. Because approximately 80% of taste disorders are truly smell disorders.
4. These taste disorders can range from obstructions in or damage to the nose to damage to the brain and nervous system in general. The most common pure taste disorder is a phantom taste sensation; this is the perception of a “bad taste in the mouth” that does not go away. The decreased ability to taste certain types of foods is known medically as hypogeusia; the absence of taste entirely is termed ageusia. Dysgeusia refers to the presence of a metallic, rancid, or foul taste in the mouth. Taking certain medications can also interfere with the ability to taste. Some loss of taste sensation also occurs during the normal aging process, so elderly people may complain of decreased ability to taste foods. Sometimes, having a cold or upper respiratory infection can result in a decrease in taste sensation.
5. Ageusia may be total or partial, and permanent or temporary.

S: 1. OD – https://en.oxforddictionaries.com/definition/ageusia (last access: 11 November 2016). 2. TERMIUM PLUS – https://goo.gl/9hYhuu (last access: 11 November 2016). 3. MD – http://emedicine.medscape.com/article/861242-overview (last access: 11 November 2016). 4. MN – http://www.medicinenet.com/loss_of_taste_sensation/symptoms.htm (last access: 11 November 2016). 5. TERMIUM PLUS – https://goo.gl/9hYhuu (last access: 11 November 2016). 6. PFB – https://goo.gl/PsoU4B (last access: 11 November 2016).

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CR: anosmia, disorder.