Cited by 43Gastrointestinal motility and disordersThyroid Disorders and TreatmentsThyroid and Parathyroid Surgery

Thyroid disorders and gastrointestinal dysmotility: an old association

Open access
Xu, Guang-Meng, Hu, Ming-Xin, Li, Si-Yu, Ran, Xuan, Zhang, Hao, Ding, Xiang-Fu·2024·Frontiers in Physiology

Abstract

Gastrointestinal motility symptoms may be closely related to thyroid diseases. Sometimes, such symptoms are the only thyroid disease-related clue although the degree of the symptoms may vary. The exact mechanism of action of thyroid hormones on gastrointestinal motility is not completely understood, however, a clue lies in the fact that muscle cell receptors can be directly acted upon by thyroxines. Both hypo- and hyperthyroidism can cause impairment of gastrointestinal motility, modifying structure and function of pharynx and esophagus, and regulating esophageal peristalsis through neuro-humoral interaction. In hyperthyroid patients, alterations of postprandial and basic electric rhythms have been observed at gastro-duodenal level, often resulting in slower gastric emptying. Gastric emptying may also be delayed in hypothyroidism, but an unrelated gastric mucosa-affecting chronic modification may also cause such pattern. Hyperthyroidism commonly show malabsorption and diarrhoea, while hypothyroidism frequently show constipation. In summary, it can be stated that symptoms of gastrointestinal motility dysfunction can be related to thyroid diseases, affecting any of the gastrointestinal segment. Clinically, the typical thyroid disease manifestations may be missing, borderline, or concealed because of intercurrent sicknesses. Motility-linked gastrointestinal problems may easily conceal a misdetected, underlying dysthyroidism that should be carefully analyzed. Here, we aim to elaborate on the associations between thyroid disorders and GI dysmotility and the common clinical manifestations associated with GI dysmotility.

AI snapshot

Written from the paper’s full text.

TL;DR

This narrative review summarizes associations between thyroid disorders and gastrointestinal dysmotility, covering hypo- and hyperthyroidism across the GI tract and common clinical manifestations. It concludes that GI motility symptoms can be linked to thyroid disease, but mechanisms remain incompletely understood and evidence is often conflicting.

Key findings

  • Hypothyroidism is associated with delayed gastric emptying, constipation, SIBO, megacolon, and pseudo-obstruction; hyperthyroidism is commonly associated with malabsorption, diarrhoea, and increased stool frequency, though constipation has also been reported.
  • SIBO was found in 54% of hypothyroidism patients by glucose breath test (Lauritano et al., 2007), and in 56% of IBS patients by positive lactose breath tests (Peralta et al., 2009).
  • In hyperthyroidism, 60%–80% of thyrotoxicosis is associated with Graves’ disease; 16% of hyperthyroid patients showed histamine-resistant achlorhydria, and 33%–37% of thyrotoxicosis patients show antiparietal cell antibodies.
  • Oral levothyroxine is incompletely absorbed, with only 70% of the administered dose reported to be absorbed; GI health improvement, including treating H. pylori, SIBO, lactose intolerance, or celiac disease, may improve thyroid medication absorption and lower levothyroxine requirements.

Methods

  • Narrative review of published literature on thyroid disorders and GI dysmotility, including hypo- and hyperthyroidism, clinical manifestations, and therapeutic approaches.
  • No primary data, systematic search strategy, or meta-analysis is described; the paper synthesizes findings from cited studies and reviews.
  • Main analysis is a narrative synthesis of mechanisms, clinical associations, and treatment implications, with tables and figures summarizing GI manifestations and proposed pathways.

Limitations

  • The paper states that the exact mechanism of thyroid hormone action on GI motility is not completely understood, and that knowledge about the relationship between GI and endocrine functions is very limited.
  • The paper states there is a lack of definite knowledge whether hormonal disturbances in thyroid disorders directly cause GI dysmotility or whether these are autonomic nervous system-mediated secondary responses.
  • Evident from the text: as a narrative review without systematic search or inclusion criteria, it reports heterogeneous and conflicting findings, such as gastric emptying being delayed, rapid, or normal in hyperthyroidism, and ghrelin levels being decreased, increased, or unaffected in hypothyroidism.

Model-written summary. Check it against the paper before relying on it.

Integrity signals

Registry

Crossref · 10.3389/fphys.2024.1389113

Cites

107 of 107 references verified0 citation errors · 0 not checkable

Statistics

Nothing to recompute.

Claims the paper makes

20 of 57 cited sources checked · 9 supported · 1 flagged · accuracy not yet measured

  • Premisecitation

    Glycosaminoglycans such as hyaluronic acid accumulation is caused by hypothyroidism in the smooth muscles and interstitial tissues of gastrointestinal tract resulting in delayed bowel transit.

    “glycosaminoglycans such as hyaluronic acid accumulation is caused by hypothyroidism in the smooth muscles and interstitial tissues of gastrointestinal tract resulting in delayed bowel transit (Maser et al., 2006).”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites Maser et al., 2006 source

      The Functional thyroid disease section says hypothyroidism causes glycosaminoglycan accumulation and that resulting edema in gastric smooth muscle may predispose to gastric dysmotility. It also reports sluggish intestinal motility in hypothyroidism, but does not establish that glycosaminoglycan accumulation throughout gastrointestinal smooth muscle causes delayed bowel transit. Page numbers are unavailable in our copy. (LLM, conf=0.88)

      Experimental — accuracy not yet measured
  • Premisecitation

    Bloating in IBS can be caused by SIBO.

    “Bloating in IBS can be caused by SIBO.”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites Peralta et al., 2009 source
  • Premisecitation

    Reduced hollow viscera motility, including stomach, colon, esophagus, and small intestine, have been observed in myxedema which gets reversed with replacement therapy for thyroid hormone.

    “Reduced hollow viscera motility, including stomach, colon, esophagus, and small intestine, have been observed in myxedema which gets reversed with replacement therapy for thyroid hormone.”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Shizuma, 2016 source

      Section 5.1 (page unavailable) says synthetic thyroid hormones are administered to correct hypothyroidism, but does not discuss digestive-tract motility or its reversal. Searches for myxedema and for reduced gastrointestinal motility with thyroid-hormone replacement found no passage addressing those observations in our copy. (LLM, conf=0.73)

      Experimental — accuracy not yet measured
  • Premisecitation

    Nearly 54% of hypothyroidism patients show presence of bacterial overgrowth in the small intestine.

    “Nearly 54% of hypothyroidism patients show presence of bacterial overgrowth in the small intestine (Lauritano et al., 2007).”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites Lauritano et al., 2007 source
  • Premisecitation

    Ghrelin has been associated with enhanced rate of gastric emptying.

    “Ghrelin has been associated with enhanced rate of gastric emptying (Levin et al., 2006; Cheung and Wu, 2013).”
    Quote in the paperNot a substantial claim1 of 2 sources checked
    • cites Levin et al., 2006 source
    • cites Cheung and Wu, 2013 source
  • Not yet classified. 1
  • May combine two claims. 14
  • Classified as probably not a substantial claim. 5
  • Not yet classified.

    Interpretation

    Since gastric myoelectrical abnormalities are not associated with the delay in gastric emptying, the delay may be a result of dysfunction in smooth muscle in coordination with the duodenum and antrum, or pylorospasm.

    “Since gastric myoelectrical abnormalities are not associated with the delay in gastric emptying, it may be a result of dysfunction in smooth muscle in coordination with the duodenum and antrum, or pylorospasm (Wang et al., 2023).”
    Quote in the paperNot yet classified1 of 1 sources checked
    • cites Wang et al., 2023 source

      Section 5.1 states that abnormal gastric slow waves are associated with delayed gastric emptying, directly contrary to the claim that myoelectrical abnormalities are not associated with it. The Introduction does identify gastric motor, pyloric, and duodenal dysfunction as possible contributors to delayed emptying, but it does not present them as alternatives established by an absence of electrical association. (LLM, conf=0.91)

      Checked by a reasoning model — may be wrong.

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    Greater GERD duration causes increased erosive esophagitis, strictures, ulceration, and Barrett's esophagus.

    “Greater GERD duration causes increased erosive esophagitis, strictures, ulceration, and Barrett’s esophagus (Lin et al., 2019; Adanir et al., 2021).”
    Quote in the paperNot a substantial claim2 of 2 sources checked
    • cites Lin et al., 2019 source

      The Introduction (page unavailable) says frequent and severe reflux may result in reflux esophagitis. The section on impaired esophageal clearance (page unavailable) also links prolonged acid exposure to esophagitis and related complications. Neither passage establishes that greater duration of GERD causes more complications, or specifically identifies strictures, ulceration, and Barrett’s esophagus as outcomes of longer GERD duration. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites Adanir et al., 2021 source

      The Results (Table 3) show more severe esophagitis and more Barrett’s esophagus in older than younger GERD patients. The Introduction also describes both as GERD-related complications. But the paper compares age groups, not GERD duration, and does not establish that longer disease duration causes these outcomes; it does not report increased strictures or ulceration. (LLM, conf=0.87)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    Hypothyroidism has also been linked with reduced stool frequency, ischemia, paralytic ileus, vascular malformations, megacolon, volvulus, and pseudoobstruction.

    “Hypothyroidism has also been linked with reduced stool frequency, ischemia, paralytic ileus, vascular malformations, megacolon, volvulus, and pseudoobstruction (Thakur et al., 2020).”
    Quote in the paperNot a substantial claim1 of 1 sources checked
    • cites Thakur et al., 2020 source

      The Discussion (page not provided) links myxedema ileus due to hypothyroidism with decreased bowel movement frequency, paralytic ileus, pseudo-obstruction, acute megacolon, and pseudo-volvulus. It also mentions intestinal ischemia as a proposed contributor to reduced gut activity. It does not mention vascular malformations, and pseudo-volvulus does not establish a link with true volvulus. (LLM, conf=0.89)

      Experimental — accuracy not yet measured
  • May combine two claims.

    Premisecitation

    Hydrogen breath tests or small bowel barium studies reveal an enhanced mouth to cecum transit time which correlates negatively with T3 concentrations in the blood.

    “Hydrogen breath tests or small bowel barium studies reveal an enhanced mouth to cecum transit time which correlates negatively with T3 concentrations in the blood (Thomas et al., 1973; Tobin et al., 1989; Wegener et al., 1992; Daher et al., 2009).”
    Quote in the paperNot a substantial claim1 of 3 sources checked
    • cites Thomas et al., 1973 source
    • cites Tobin et al., 1989 source

      The Results report that hydrogen breath testing found shorter orocaecal transit times in hyperthyroid patients than in controls (49 versus 85 minutes). The paper also discusses barium studies reporting rapid transit, but our copy does not report a correlation between transit time and blood T3 concentrations. If “enhanced transit time” means a longer time rather than faster transit, it does not describe this paper’s finding. (LLM, conf=0.86)

      Experimental — accuracy not yet measured
    • cites Wegener et al., 1992 source
  • May combine two claims.

    Premisecitation

    In a patient with SIBO, optimal TSH balance was not achieved with multiple medication changes over 6 months, but symptoms resolved and euthyroidism was achieved after treatment with rifaximin for SIBO plus liquid T4.

    “The patient in question could not achieve optimal TSH balance even after multiple medication changes over a 6-month duration.”
    • Also stated in: § Thyroid hormone absorption is improved by GI therapies · plain
      “Her symptoms could only be resolved and euthyroidism achieved when she was treated with rifaximin for SIBO besides receiving liquid T4 (Bohinc Henderson, 2021).”
    Quote in the paperSubstantial claim1 of 1 sources checked
    • cites Bohinc Henderson, 2021 source
  • May combine two claims.

    Premisecitation

    Helicobacter pylori treatment improves TSH levels and lowers the required dose of levothyroxine.

    “In addition, there are studies that show improved levels of TSH upon Helicobacter pylori treatment that lower the required dose of levothyroxine (Centanni et al., 2006; Ribichini et al., 2017).”
    Quote in the paperSubstantial claim1 of 2 sources checked
    • cites Centanni et al., 2006 source

      The prospective-study passage reports that TSH fell after H. pylori eradication in 11 patients with multinodular goiter. It does not support the claimed reduction in levothyroxine dose: the median dose after eradication was slightly higher, 1.70 versus 1.56 μg/kg/day. (LLM, conf=0.92)

      Experimental — accuracy not yet measured
    • cites Ribichini et al., 2017 source
  • May combine two claims.

    Premisecitation

    When on similar high-fat diets, hyperthyroid patients excreted significantly excess fecal fat as compared to normal individuals, ruling out hyperphagia as the only mechanism.

    “When on similar high-fat diets, hyperthyroid patients excreted significantly excess fecal fat as compared to normal individuals, ruling out hyperphagia as the only mechanism.”
    Quote in the paperSubstantial claim0 of 1 sources checked
    • cites Thomas et al., 1973 source
  • May combine two claims.

    Premisecitation

    In some hypothyroidism individuals, secretion of acid is diminished, a finding that can be linked to gastric mucosa changes but not with the severity or duration of the hypo-functioning thyroid.

    “In some hypothyroidism individuals, secretion of acid is diminished, a finding that can be linked to gastric mucosa changes but not with the severity or duration of the hypo-functioning thyroid (Dotevall et al., 1967).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Dotevall et al., 1967 source
  • May combine two claims.

    Premisereasoning

    Both hypo- and hyperthyroidism can cause impairment of gastrointestinal motility, modifying structure and function of pharynx and esophagus, and regulating esophageal peristalsis through neuro-humoral interaction.

    “Both hypo- and hyperthyroidism can cause impairment of gastrointestinal motility, modifying structure and function of pharynx and esophagus, and regulating esophageal peristalsis through neuro-humoral interaction.”
    Quote in the paperSubstantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based). May combine two claims.

    Premisenone given

    Gastric emptying may also be delayed in hypothyroidism, but an unrelated gastric mucosa-affecting chronic modification may also cause such pattern.

    “Gastric emptying may also be delayed in hypothyroidism, but an unrelated gastric mucosa-affecting chronic modification may also cause such pattern.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S3 (load-bearing), S4 (based).

    Premisenone given

    GERD pathogenesis depends greatly on lower esophageal sphincter competence, gastric emptying, and esophageal clearance.

    “GERD pathogenesis depends greatly on lower esophageal sphincter competence, gastric emptying, and esophageal clearance.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Excretion of excess fecal fat is commonly observed in hyperthyroidism, which may be due to excessive fat ingestion through diet since the fat absorption coefficient is found normal in those individuals.

    “Excretion of excess fecal fat is commonly observed in hyperthyroidism, which may be due to excessive fat ingestion through diet since the fat absorption coefficient is found normal in those individuals (Thomas et al., 1973).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Thomas et al., 1973 source
  • May combine two claims.

    Premisenone given

    Hyperthyroidism commonly show malabsorption and diarrhoea, while hypothyroidism frequently show constipation.

    “Hyperthyroidism commonly show malabsorption and diarrhoea, while hypothyroidism frequently show constipation.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S4 (based).

    Interpretationnone given

    Impaired GI motility presents with features like gastritis, dysphagia, nausea/vomiting, GI bleeding, and SIBO.

    “Impaired GI motility presents itself with features like gastritis, dysphagia, nausea/vomiting, GI bleeding and SIBO.”
    Quote in the paperNot a substantial claim
  • Probably not a substantial claim: may not pass S2 (checkable), S4 (based).

    Interpretationnone given

    The impact of the thyroid on the GI tract may vary depending on the kind of involvement and the overall hormonal disturbance-associated effect.

    “The impact of the thyroid on GI tract may vary depending on the involvement kind and the overall hormonal disturbance-associated effect (Figure 2).”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Premisecitation

    Levothyroxine is not completely absorbed orally; approximately 70% of an administered oral dose is absorbed.

    “Levothyroxine is not completely absorbed orally with only 70% of the dose administered is reported to be absorbed (Hays, 1991).”
    Quote in the paperNot a substantial claim0 of 1 sources checked
    • cites Hays, 1991 source
  • Probably not a substantial claim: may not pass S4 (based). May combine two claims.

    Interpretationnone given

    Thyroid disorders like hypo- and hyperthyroidism deregulate hormonal balance, resulting in imbalances like autoantibody production and bile acid production, thereby leading to GI dysmotility.

    “Thyroid disorders like hypo- and hyperthyroidism that deregulates its hormonal balance results in imbalances like autoantibody production and bile acid production thereby leading to GI dysmotility.”
    Quote in the paperNot a substantial claim
  • May combine two claims.

    Interpretationnone given

    Oral thyroxine bioavailability might be impacted by gastric physiology variations, leading to increased drug need.

    “However, oral thyroxine bioavailability might be impacted by gastric physiology variations, leading to increased drug need.”
    Quote in the paperNot a substantial claim
18 of 18
  • The paper relies on this without support.

    The exact mechanism of action of thyroid hormones on gastrointestinal motility is not completely understood.

    “The exact mechanism of action of thyroid hormones on gastrointestinal motility is not completely understood”
  • The paper relies on this without support.

    No study has been carried out regarding the association of ghrelin with gastric motility in response to a meal in subclinical hypothyroidism.

    “No study has been carried out regarding the association of ghrelin with gastric motility in response to a meal in subclinical hypothyroidism (SCH).”
  • The paper relies on this without support.

    The thyroid gland influences GI physiology.

    “There is no question regarding the influence of thyroid gland on the GI physiology.”
3 of 3

Cites

Flagged first, then by citations

8 of the 115 references couldn’t be matched to a known paper.

Research works printed but not linked: 2

  1. Pirahanchi, 2024, Physiology, thyroid stimulating hormone
  2. Prosapio, 2024, Physiology, gastrin

Cited by

Sorted by citations

Authors
Xu, G.-M., Hu, M.-X., Li, S.-Y., Ran, X., Zhang, H., & Ding, X.-F.
Affiliations
Jilin University (CN)
Corresponding author
Ding, Xiang-Fu
Venue
Frontiers in Physiology
Published
2024-05-02
Volume
15
Pages
1389113-1389113
ISSN
1664-042X (ISSN-L)
OpenAlex
W4396598182
Cited by
43
References
115
Citations by year
2026: 16 · 2025: 19 · 2024: 8
FWCI
16.55
Type
journal article
Language
en
Open access
Locations
  • Frontiers in Physiology (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • PubMed Central (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
  • Natural Science Foundation of Jilin Province
  • People's Government of Jilin Province
Topics
  • Health Sciences › Medicine › Gastroenterology › Gastrointestinal motility and disorders
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Thyroid Disorders and Treatments
  • Health Sciences › Medicine › Surgery › Thyroid and Parathyroid Surgery
Keywords
thyroid dysfunction, gastrointestinal motility disorders, hyperthyroidism, hypothyroidism, gastric emptying, esophageal peristalsis, esophageal motility, constipation, diarrhea, malabsorption

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Classified by jev-1.13-20260917 (gold-guideline-v0.2) on 2026-10-14.

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