Atrophic Glossitis: The Smooth, Sore Tongue and the Blood Tests Behind It


A healthy tongue feels slightly rough because its top is covered in tiny bumps. In atrophic glossitis those bumps are partly or completely gone, and the tongue looks smooth and often feels sore. Medical teaching has long treated this as a sign of a missing vitamin or mineral. The studies that actually drew blood from these patients tell a messier story. One found low vitamin B12 in 7.4% of patients and another in 68.22%. Many patients had no shortage at all. Some turned out to have a yeast infection, antibodies against their own stomach or thyroid, or dry mouth. This page sets out what those studies measured, what treatment reports found, and what remains unknown.

The site's folate page on mouth sores and sore tongue and vitamin B12 page on sore tongue and mouth explain why a shortage of those vitamins affects a fast-renewing lining. This page starts from the tongue instead, and asks what is found when people with this tongue are tested.


Table of Contents

  1. What a Smooth Tongue Is
  2. Burning and Soreness
  3. How Often Studies Find It
  4. Vitamins and Minerals Linked to It
  5. Autoantibodies and Pernicious Anemia
  6. Candida, Diabetes and Dry Mouth
  7. Where Studies Found No Link
  8. The Blood Tests Used and What They Found
  9. Treatment Results Reported
  10. How It Differs From Similar Conditions
  11. What Is Not Known
  12. Key Research Papers
  13. Connections
  14. Featured Videos

What a Smooth Tongue Is

The tiny bumps on the top of the tongue are called papillae. The most numerous kind, the filiform papillae, give the tongue its velvety, matte surface. A 2020 review from Taiwan defines atrophic glossitis as the partial or complete absence of these filiform papillae on the top surface of the tongue.

Researchers do not all draw the line in the same place, and that matters when comparing their numbers:

Atrophic glossitis is a description of how a tongue looks. It does not name a cause. Several different conditions can leave a tongue looking this way, and most of this page is about telling them apart.

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Burning and Soreness

Pain with eating recurs across these reports. All 40 patients in the Japanese series of atrophic tongue complained of tongue pain with spicy or hot food. A 2020 letter from Taiwan describes patients with pernicious anemia as usually having a complete or partial smooth tongue, sensitivity to spicy or hot food, burning and numbness of the tongue, and loss of taste, which can finally make eating or swallowing difficult.

Not everyone reports burning. In 64 patients whose mouth problems led to a diagnosis of low iron, 59% had atrophic glossitis and 28% had burning mouth.

The burning can also lead to the wrong label. A published case describes a 73-year-old woman with several months of tongue pain who was first diagnosed with burning mouth disorder. A later examination found a beefy, red, smooth tongue, and blood tests showed low vitamin B12 and enlarged red blood cells. The authors' final diagnosis was atrophic glossitis and tongue pain from vitamin B12 deficiency, most likely caused by pernicious anemia.

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How Often Studies Find It

No study found for this page counts atrophic glossitis across a general population of all ages. The available figures come from particular groups, and they vary a great deal.

The contrast between home and hospital in the Norwegian survey fits the authors' conclusion that atrophic glossitis is a marker of malnutrition and reduced muscle function in older age. Being ill in hospital and having a smooth tongue went together, but the survey cannot show which came first.

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Vitamins and Minerals Linked to It

The 2020 Taiwanese review lists riboflavin, niacin, pyridoxine, vitamin B12, folic acid, iron, zinc and vitamin E as nutrients whose shortage may show up as a smooth tongue. A 2010 review for primary care doctors names iron, folic acid, vitamin B12, riboflavin and niacin. Those are the lists. The blood studies below measured only some of these nutrients, chiefly iron, vitamin B12 and folate.

Share of atrophic glossitis patients with each finding
StudyLow hemoglobinLow ironLow vitamin B12Low folate
Taiwan 2012, 176 patients22.2%26.7%7.4%1.7%
Taiwan 2020 review, 1,064 patients19.0%16.9%5.3%2.3%
Qingdao 2020, 124 patients48.39%22.58% (ferritin)29.03%11.29%
Guangzhou 2022, 236 patients21.61%13.98% (ferritin)68.22%not given in abstract

Serum iron and ferritin are different measures, so the iron column does not compare like with like. A fifth report, from Shanghai, found low vitamin B12 in 50 of 72 newly enrolled patients, and megaloblastic anemia or enlarged red cells in 97 of 213 patients (45.4%) seen over three decades. Those authors called vitamin B12 deficiency possibly the main cause of atrophic glossitis. The two large Taiwanese series, where iron shortage was more common than vitamin B12 shortage, point the other way. The abstracts do not explain the gap. The 2012 study used a vitamin B12 cutoff of 200 pg/mL; the cutoffs behind the other figures are not stated in the abstracts, and the patients were drawn from different places.

Vitamin B12. The Guangzhou authors concluded that atrophic glossitis could be an important sign of possible vitamin B12 deficiency, especially when more than half the tongue is affected or atrophy is complete. In the Taiwanese series, 56 of the 1,064 patients were short of vitamin B12. Among those 56, 53.6% had enlarged red cells, 64.3% had low hemoglobin and 89.3% had high homocysteine.

Iron. A small 1993 pilot in nine people with glossitis found laboratory evidence suggesting iron deficiency in five. In the Taiwanese series, 180 of the 1,064 patients had low serum iron, but low iron did not mean iron deficiency anemia. Of the 83 who were anemic, 40 had normocytic anemia, 30 had iron deficiency anemia, 9 had pernicious anemia and 4 had anemia from thalassemia trait.

Riboflavin and other B vitamins. Riboflavin (vitamin B2) and niacin appear on the reviews' lists, but none of the patient studies read for this page reported measuring them. Two older patients in a 1991 case report were tested far more widely by a specialist nutrition laboratory. Both had evidence of protein and calorie malnutrition and were deficient or marginally deficient in several vitamins and trace minerals. The authors said much work was still needed to learn how well physical signs like this predict low blood levels.

Calories and protein. The Norwegian survey tied atrophic glossitis to lower weight, body mass index, skinfold thickness, arm muscle, strength and daily-living ability. In its final statistical model, only cholesterol, muscle strength and daily-living ability remained linked to the tongue finding.

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Autoantibodies and Pernicious Anemia

Some people with a smooth tongue carry antibodies against their own tissues. The largest study measured three of them in 1,064 patients and 532 matched healthy people.

About 55.3% of the patients had at least one of the three. Among 373 patients positive for a thyroid antibody whose thyroid-stimulating hormone was measured, 78.6% had a normal level, 8.0% a low level and 13.4% a high level. Most had a normal result.

The stomach antibody matters because of pernicious anemia, the autoimmune condition in which the stomach stops supporting vitamin B12 absorption. Patients with this antibody had significantly more enlarged red cells, low vitamin B12 and high homocysteine than patients without it. Among 63 anemic patients with the antibody, the commonest types were normocytic anemia (42.9%), pernicious anemia (34.9%) and iron deficiency anemia (15.9%). Higher antibody levels went with more problems: of 117 patients with a high level, 29.1% had low hemoglobin and 16.2% low vitamin B12, against 17.4% and 7.2% of 167 patients with a low level.

Pernicious anemia itself was uncommon in the series as a whole: 22 of 1,064 patients (2.1%). All 22 were among those with high homocysteine, and none were among the other 937. Among the 56 patients short of vitamin B12, 36 were anemic, and 22 of those 36 (61.1%) had pernicious anemia, the commonest type in that group.

The thyroid antibodies looked different. Comparing 304 patients positive only for thyroid antibodies with 476 who had none of the three, a 2019 study found no significant differences in anemia or in iron, folate or homocysteine, though low vitamin B12 was more frequent in the thyroid antibody group.

The Taiwanese authors write that some patients with the stomach antibody may go on to develop pernicious anemia, autoimmune atrophic gastritis or stomach cancer, and that some with thyroid antibodies may have thyroid dysfunction. They called for these patients to be referred to medical doctors for further care. Their study measured antibodies at one point and did not follow patients over time to count how many developed these conditions.

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Candida, Diabetes and Dry Mouth

Candida yeast. The Japanese series of 40 patients is the clearest report. Candida grew from 72.5% of them, almost all of it Candida albicans. Blood tests were within reference levels in 29 of the 40 (72.5%), so most of these patients had no sign of anemia or diabetes. In a Chinese series of 124 patients, 79.03% had Candida infection, significantly more than among 53 healthy controls. Among the 64 patients with low iron and a sore mouth, 85% had Candida infection, which suggests the two problems can occur together. The site's oral thrush page covers the red form of thrush, which has no white coating.

Dry mouth. In the Chinese series, 41.94% of patients had dry mouth. A Japanese study of 231 patients who complained of dry mouth looked at what went with a smooth tongue. Two factors stood out: more Candida albicans and less saliva when saliva flow was stimulated. Other Candida species showed no such link. The authors describe those patients as having no systemic predisposing factors. The site's dry mouth page covers the wider topic.

Diabetes. The evidence here is older and thinner. A 1976 study of 175 diabetic outpatients in South Africa found atrophic tongue lesions in 26.9%, and 91.7% of those lesions were central papillary atrophy, a patch in the middle of the tongue, not a tongue smooth all over. How well the diabetes was controlled was not related to how often the patch appeared. In the Japanese Candida series, mild diabetes turned up in 4 of 40 patients (10.0%). The 2020 review lists diabetes among the causes.

Bacteria. The review also lists Helicobacter pylori, the stomach bacterium. In a Croatian study of tongue tissue from 268 patients, the bacterium was found in 16% of samples overall, and it was found significantly more often in atrophic glossitis than in geographic tongue. The authors suggested that the altered surface may simply make the tongue easier to colonize, so the finding does not show that the bacterium causes the smooth tongue. A sequencing study of saliva found lower bacterial and fungal diversity in atrophic glossitis patients than in healthy people, and proposed Lactobacillus and Saccharomycetales as possible markers. The abstract does not report testing this as a way to diagnose the condition.

Celiac disease. A 2007 letter titled "Atrophic glossitis leading to the diagnosis of celiac disease" reports this route to a diagnosis. It has no abstract, and a single letter gives no rate.

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The textbook picture is that a smooth tongue means a shortage. These results do not fit it:

A low or normal result in a study does not settle things for one person. It does show that a smooth tongue on its own cannot tell anyone which, if any, shortage is present.

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The Blood Tests Used and What They Found

The authors of the 2020 review argue that a complete blood count, serum vitamin and mineral levels, homocysteine and autoantibodies are all important to check before treatment starts. Here is what each of those tests reported in these studies.

Enlarged red cells alone did not settle the diagnosis either. Among 60 people with mouth-lining disease and enlarged red cells, only 40.0% had low vitamin B12, and only 16.7% met the World Health Organization definition of pernicious anemia that study used.

The 64-patient low-iron series also reports something beyond the mouth. Two of those patients were found to have colorectal cancer, and the author wrote that the origin of iron deficiency anemia needs investigating because it may be the first sign of a more serious disease.

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Treatment Results Reported

The searches for this page found no randomized, placebo-controlled trial of treatment for atrophic glossitis, though one may exist that they missed. What exists is case reports and uncontrolled series, so improvement cannot be separated from the natural course of the condition or from placebo effects.

The 2020 review sums up by saying that supplements can achieve complete remission of symptoms and tongue atrophy in some patients. It does not say all. Questions about any individual treatment are ones for a clinician who has the blood results.

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How It Differs From Similar Conditions

Three other conditions come up most often in these studies. The table below shows how similar their blood tests can look. All three studies come from the same Taiwanese group and measure the same things.

Blood findings in three mouth conditions, Taiwanese series
FindingAtrophic glossitis (1,064)Burning mouth syndrome (884)Oral lichen planus (588)
Low hemoglobin19.0%19.8%25.2%
Low serum iron16.9%16.2%16.8%
Low vitamin B125.3%4.8%10.2%
Low folic acid2.3%2.3%1.2%
High homocysteine11.9%19.2%21.1%
Stomach antibody26.7%12.3%23.6%
Pernicious anemia, cases221517

The burning mouth and lichen planus papers report the first six rates as significantly higher than in healthy controls. The atrophic glossitis papers report the same for the blood findings, in patients with and without the stomach antibody. So a blood result alone does not sort these conditions. What sets them apart is what the mouth looks like.

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What Is Not Known

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Key Research Papers

  1. Chiang CP, Chang JY, Wang YP, Wu YH, Wu YC, Sun A. Atrophic glossitis: Etiology, serum autoantibodies, anemia, hematinic deficiencies, hyperhomocysteinemia, and management. J Formos Med Assoc. 2020;119(4):774-780. PubMed PMID: 31076315
  2. Sun A, Lin HP, Wang YP, Chiang CP. Significant association of deficiency of hemoglobin, iron and vitamin B12, high homocysteine level, and gastric parietal cell antibody positivity with atrophic glossitis. J Oral Pathol Med. 2012;41(6):500-4. PubMed PMID: 22188475
  3. Chen GY, Tang ZQ, Bao ZX. Vitamin B12 deficiency may play an etiological role in atrophic glossitis and its grading: A clinical case-control study. BMC Oral Health. 2022;22(1):456. PubMed PMID: 36307840
  4. Wu YC, Wu YH, Chang JY, Wang YP, Kuo YS, Sun A. Anemia, hematinic deficiencies, hyperhomocysteinemia, and gastric parietal cell antibody positivity in atrophic glossitis patients with vitamin B12 deficiency. J Formos Med Assoc. 2020;119(3):720-727. PubMed PMID: 31630933
  5. Chiang CP, Wu YC, Chang JY, Wang YP, Wu YH, Sun A. Anemia, hematinic deficiencies, hyperhomocysteinemia, and gastric parietal cell antibody positivity in atrophic glossitis patients with iron deficiency. J Formos Med Assoc. 2020;119(2):587-594. PubMed PMID: 31607629
  6. Chiang CP, Wu YC, Chang JY, Wang YP, Wu YH, Sun A. Anemia, hematinic deficiencies, and gastric parietal cell antibody positivity in atrophic glossitis patients with or without hyperhomocysteinemia. J Formos Med Assoc. 2020;119(1 Pt 3):544-552. PubMed PMID: 31444017
  7. Chiang CP, Chang JY, Wang YP, Wu YH, Wu YC, Sun A. Gastric parietal cell and thyroid autoantibodies in patients with atrophic glossitis. J Formos Med Assoc. 2019;118(6):973-978. PubMed PMID: 30736997
  8. Chiang CP, Chang JY, Wang YP, Wu YH, Wu YC, Sun A. Anemia, hematinic deficiencies, and hyperhomocysteinemia in gastric parietal cell antibody-positive and -negative atrophic glossitis patients. J Formos Med Assoc. 2019;118(2):565-571. PubMed PMID: 30581105
  9. Chiang CP, Wu YH, Chang JY, Wang YP, Wu YC, Sun A. Does serum gastric parietal cell antibody titer have influence on anemia and vitamin B12 deficiency in atrophic glossitis patients? J Formos Med Assoc. 2020;119(1 Pt 2):377-383. PubMed PMID: 31277918
  10. Kuo YS, Wu YH, Chang JY, Wang YP, Wu YC, Sun A. Blood profile of atrophic glossitis patients with thyroglobulin antibody/thyroid microsomal antibody positivity but without gastric parietal cell antibody positivity. J Formos Med Assoc. 2019;118(8):1218-1224. PubMed PMID: 31005374
  11. Chang JY, Wang YP, Wu YC, Cheng SJ, Chen HM, Sun A. Hematinic deficiencies and pernicious anemia in oral mucosal disease patients with macrocytosis. J Formos Med Assoc. 2015;114(8):736-41. PubMed PMID: 25935499
  12. Wu YC, Wu YH, Wang YP, Chang JY, Chen HM, Sun A. Hematinic deficiencies and anemia statuses in recurrent aphthous stomatitis patients with or without atrophic glossitis. J Formos Med Assoc. 2016;115(12):1061-1068. PubMed PMID: 27839675
  13. Du HX, Wei CL, Zhang H, Deng J, Guo YQ, Zheng WP, Yuan CQ. [Related factors of atrophic glossitis in 124 consecutive cases]. Shanghai Kou Qiang Yi Xue. 2020;29(4):423-426. PubMed PMID: 33089295
  14. Zhu JC, Wang YF, Sheng J, Chen FX, Tang GY. [Atrophic glossitis is attributed to cobalamin deficiency]. Shanghai Kou Qiang Yi Xue. 2013;22(1):58-62. PubMed PMID: 23552783
  15. Bøhmer T, Mowé M. The association between atrophic glossitis and protein-calorie malnutrition in old age. Age Ageing. 2000;29(1):47-50. PubMed PMID: 10690695
  16. Enwald CV, Drinka PJ, Swortz C, Langer EH, Voeks SK. Iron status in atrophic glossitis: a pilot study. Wis Med J. 1993;92(10):570-3. PubMed PMID: 8266715
  17. Drinka PJ, Langer E, Scott L, Morrow F. Laboratory measurements of nutritional status as correlates of atrophic glossitis. J Gen Intern Med. 1991;6(2):137-40. PubMed PMID: 1902511
  18. Cunha SF, Melo DA, Braga CB, Vannucchi H, Cunha DF. Papillary atrophy of the tongue and nutritional status of hospitalized alcoholics. An Bras Dermatol. 2012;87(1):84-9. PubMed PMID: 22481655
  19. Terai H, Shimahara M. Atrophic tongue associated with Candida. J Oral Pathol Med. 2005;34(7):397-400. PubMed PMID: 16011607
  20. Nakamura S, Okamoto MR, Yamamoto K, Tsurumoto A, Yoshino Y, Iwabuchi H, Saito I, Maeda N, Nakagawa Y. The Candida species that are important for the development of atrophic glossitis in xerostomia patients. BMC Oral Health. 2017;17(1):153. PubMed PMID: 29246167
  21. Lu SY. Perception of iron deficiency from oral mucosa alterations that show a high prevalence of Candida infection. J Formos Med Assoc. 2016;115(8):619-27. PubMed PMID: 27133388
  22. Farman AG. Atrophic lesions of the tongue: a prevalence study among 175 diabetic patients. J Oral Pathol. 1976;5(5):255-64. PubMed PMID: 824423
  23. Gall-Troselj K, Mravak-Stipetić M, Jurak I, Ragland WL, Pavelić J. Helicobacter pylori colonization of tongue mucosa--increased incidence in atrophic glossitis and burning mouth syndrome (BMS). J Oral Pathol Med. 2001;30(9):560-3. PubMed PMID: 11555160
  24. Li H, Sun J, Wang X, Shi J. Oral microbial diversity analysis among atrophic glossitis patients and healthy individuals. J Oral Microbiol. 2021;13(1):1984063. PubMed PMID: 34676060
  25. Pastore L, Lo Muzio L, Serpico R. Atrophic glossitis leading to the diagnosis of celiac disease. N Engl J Med. 2007;356(24):2547. PubMed PMID: 17568041
  26. Sun A, Wang YP, Lin HP, Chen HM, Cheng SJ, Chiang CP. Significant reduction of homocysteine level with multiple B vitamins in atrophic glossitis patients. Oral Dis. 2013;19(5):519-24. PubMed PMID: 23130817
  27. Wu YH, Hwang MJ, Lee YP, Chiang CP. Atrophic glossitis in pernicious anemia patients can be treated to normal in two weeks by intramuscular injection of vitamin B12. J Dent Sci. 2020;15(4):558-559. PubMed PMID: 33505632
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  29. Nepal TN, Gyaltshen D. Outbreak of glossitis in a boarding school, diagnostic challenges and the outcome after treatment with Vitamin B Complex tablets: A retrospective descriptive study. SAGE Open Med. 2024;12:20503121241241215. PubMed PMID: 38545234
  30. Chiang CP, Wu YH, Wu YC, Chang JY, Wang YP, Sun A. Anemia, hematinic deficiencies, hyperhomocysteinemia, and serum gastric parietal cell antibody positivity in 884 patients with burning mouth syndrome. J Formos Med Assoc. 2020;119(4):813-820. PubMed PMID: 31679908
  31. Wu YH, Yu-Fong Chang J, Lee YP, Wang YP, Sun A, Chiang CP. Anemia, hematinic deficiencies, hyperhomocysteinemia, and serum gastric parietal cell antibody positivity in 588 patients with oral lichen planus. J Dent Sci. 2025;20(1):660-666. PubMed PMID: 39873037
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PubMed Topic Searches

  1. PubMed: Atrophic glossitis
  2. PubMed: Atrophic glossitis with vitamin B12 and iron
  3. PubMed: Atrophic glossitis and Candida
  4. PubMed: Atrophic glossitis and gastric parietal cell antibody

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Connections

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