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Smooth Tongue: Causes, Symptoms & Treatment

A smooth tongue is a symptom in which the tongue appears shiny, flat and reddened due to loss of papillae. It often indicates an underlying nutrient deficiency.

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Things worth knowing about "Smooth tongue"

A smooth tongue is a symptom in which the tongue appears shiny, flat and reddened due to loss of papillae. It often indicates an underlying nutrient deficiency.

What is a Smooth Tongue?

A smooth tongue (medically referred to as atrophic glossitis or Hunter glossitis) is a condition in which the surface of the tongue appears unusually shiny, smooth, and often bright red. This occurs due to the loss or flattening of the lingual papillae – the small bumps on the tongue surface that are responsible for taste perception and texture. A smooth tongue is not a disease in itself but rather a clinical sign pointing to an underlying illness or nutritional deficiency.

Causes

A smooth tongue can be caused by several conditions and deficiency states:

Iron deficiency anaemia: Insufficient iron impairs the health of the oral mucosa and can lead to papillary atrophy.
Vitamin B12 deficiency: One of the most common causes, leading to classic Hunter glossitis with a smooth, beefy-red tongue.
Folate deficiency: A lack of folic acid (vitamin B9) can cause similar changes to the tongue surface.
Other B-vitamin deficiencies: Deficiencies in riboflavin (B2), niacin (B3), or pyridoxine (B6) may also contribute to tongue changes.
Pellagra: Severe niacin deficiency can cause tongue and skin manifestations.
Zinc deficiency: Zinc plays a role in maintaining the integrity of oral mucous membranes.
Inflammatory bowel disease: Conditions such as Crohn's disease or ulcerative colitis may impair nutrient absorption.
Alcohol misuse: Excessive alcohol consumption is associated with multiple vitamin deficiencies.

Symptoms

A smooth tongue is itself a symptom but is often accompanied by other complaints:

Shiny, flat, and often bright red tongue surface
Burning sensation or pain on the tongue (glossodynia)
Altered or reduced sense of taste
Dry mouth
Difficulty swallowing in some cases
Systemic symptoms related to the underlying deficiency, such as fatigue, pallor, or neurological symptoms in vitamin B12 deficiency

Diagnosis

Diagnosis is primarily made through a clinical examination by a physician or dentist. To identify the underlying cause, the following investigations are typically performed:

Blood tests: Assessment of iron levels (ferritin, haemoglobin), vitamin B12, folate, zinc, and other micronutrients.
Medical history: Evaluation of dietary habits, medications, pre-existing conditions, and alcohol consumption.
Further investigations: If a malabsorption disorder is suspected, gastroscopy or colonoscopy may be required.

Treatment

Treatment of a smooth tongue is directed at the underlying cause:

Iron supplementation: Oral or intravenous iron preparations are used to treat iron deficiency anaemia.
Vitamin B12 supplementation: Depending on the cause, B12 may be given as injections (in cases of malabsorption) or as oral supplements.
Folate supplementation: Folic acid can be taken as tablets.
Dietary adjustment: A balanced, nutrient-rich diet supports regeneration of the lingual papillae.
Treatment of the underlying condition: Inflammatory bowel disease or other systemic causes are treated specifically.

Once the underlying cause is successfully treated, the smooth tongue typically resolves completely and the lingual papillae regenerate.

References

Kasper, D.L. et al. (eds.) – Harrison's Principles of Internal Medicine, 21st edition, McGraw-Hill Education, 2022.
World Health Organization (WHO) – Nutritional Anaemias: Tools for Effective Prevention and Control. WHO Press, Geneva, 2017. Available at: https://www.who.int
Greenberg, S.A. – Glossitis and oral manifestations of nutritional deficiencies. UpToDate, 2023. Available at: https://www.uptodate.com

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