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Hemorrhoids

Cardiovascular Medicine · NLM MeSH · updated 2026-10-29 · version 1

Citations verified against PubMedNot yet clinician-reviewed10 referencesApproximately 5 min read

Swollen veins in the lower part of the rectum or ANUS.

Table of Contents

1. Definition2. Research landscape3. Reading the evidence4. Open-access studies5. Key reviews6. References7. About this article

Definition and research guide

This page combines a MeSH definition, publication statistics and selected research abstracts. It is a starting point for reading the literature, not a medical textbook or a systematic evidence review.

Content available: 4 complete abstracts (960 words), 10 references. Full article text is not stored or reproduced here; follow the PMID, DOI or PMC links to read the original sources and their access terms.

Definition

Swollen veins in the lower part of the rectum or ANUS. Hemorrhoids can be inside the anus (internal), under the skin around the anus (external), or protruding from inside to outside of the anus. People with hemorrhoids may or may not exhibit symptoms which include bleeding, itching, and pain.

Definition: NLM Medical Subject Headings (MeSH) scope note (Public domain (U.S. National Library of Medicine); attribution requested). View the MeSH record.

Also known as: Hemorrhoid.

Where it fits in the MeSH classification

Broader topics
Rectal Diseases; Vascular Diseases

Related concepts

  • Rectum

Research landscape

PubMed indexes 5,898 records tagged with the MeSH heading “Hemorrhoids” (counts retrieved 2026-10-29). 737 of them (12.5%) were published from 2020 onward, and the busiest period so far is through 1999 with 2,967 records.

Reviews account for 529 records (9.0%) and meta-analyses for 98. Randomized controlled trials number 570 (9.7%) as a share of all records on the topic. Randomized trials make up a comparatively large share of this literature, which means many treatment questions have been tested directly.

PubMed records by publication periodthrough 1999: 2,967 records; 2000-2009: 1,203 records; 2010-2019: 991 records; 2020 onward: 737 records2,967through 19991,2032000-20099912010-20197372020 onward
Records in PubMed indexed with this heading, by publication period. Real counts from NCBI E-utilities; the final period covers only part of the current year. Volume reflects how much has been published, not how strong the evidence is.
Show the data
PeriodRecords
through 19992,967
2000-20091,203
2010-2019991
2020 onward737
Share of records by publication typeReviews: 9.0 percent; Meta-analyses: 1.7 percent; Randomized controlled trials: 9.7 percentReviews9.0% (529)Meta-analyses1.7% (98)Randomized controlled trials9.7% (570)
Share of all PubMed records on this heading that carry each publication type. Types overlap with other records, so the shares do not sum to 100%.
Publication-type chart data
Publication types among 5,898 PubMed records
TypeRecordsShare
Reviews5299.0%
Meta-analyses981.7%
Randomized controlled trials5709.7%

Method: PubMed query "Hemorrhoids"[MeSH Terms] with publication-type and date filters, retrieved 2026-10-29.

Reading the evidence in cardiovascular medicine

Cardiovascular medicine has an unusually large body of randomized trials, so the type of outcome matters: hard clinical events such as death, heart attack and stroke carry more weight than changes in blood pressure, cholesterol or imaging markers that only predict risk. Observational studies can show associations but are confounded by age, lifestyle and other illness. Check whether a result is about prevention or treatment, the baseline risk of participants, and the absolute rather than only the relative size of any benefit.

Evidence from open-access studies

These open-access studies come from PubMed’s best-match results for this heading (papers whose main topic it is), ranked here by citation count, with one recent addition. Each abstract is reproduced in full under its recorded open licence so that you can read the authors’ own words. They illustrate the literature; they are not a systematic summary of it. Citation counts measure attention, not reliability or clinical benefit.

Study comparison — selected abstracts, not a systematic review
Study / authorsYearSource label / designEurope PMC citationsLicence / source
Consensus statement of the Italian society of colorectal surgery (SICCR): management and treatment of hemorrhoidal disease
Gallo G, Martellucci J, Sturiale A, Clerico G, Milito G, Marino F, et al.
2020Review article
Design not recorded in structured metadata
168cc by
PMID 31993837 · DOI · PMC7005095
Comparison of stapled haemorrhoidopexy with traditional excisional surgery for haemorrhoidal disease (eTHoS): a pragmatic, multicentre, randomised controlled trial
Watson AJ, Hudson J, Wood J, Kilonzo M, Brown SR, McDonald A, et al.
2016Randomized controlled trial
Design not recorded in structured metadata
85cc by
PMID 27726951 · DOI · PMC5269572
Risk Factors for Hemorrhoids on Screening Colonoscopy
Peery AF, Sandler RS, Galanko JA, Bresalier RS, Figueiredo JC, Ahnen DJ, et al.
2015Research article
Design not recorded in structured metadata
67cc by
PMID 26406337 · DOI · PMC4583402
Worldwide prevalence of haemorrhoids: a systematic review and meta-analysis
Esmaeilnia Shirvani A, Pakdaman K, Maleki Z, Soraneh S, Rezaei Chegini F, Pakdaman K, et al.
2026Meta-analysis
Design not recorded in structured metadata
7cc by
PMID 41450176 · DOI · PMC12777808

Consensus statement of the Italian society of colorectal surgery (SICCR): management and treatment of hemorrhoidal disease [1]

Review article Gallo G, Martellucci J, Sturiale A, Clerico G, Milito G, Marino F, et al. · · 2020 · cited 168 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
Hemorrhoidal disease (HD) is the most common proctological disease in the Western countries.
Closing excerpt
The recommendations were graded A, B, and C.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (108 words)

Hemorrhoidal disease (HD) is the most common proctological disease in the Western countries. However, its real prevalence is underestimated due to the frequent self-medication.The aim of this consensus statement is to provide evidence-based data to allow an individualized and appropriate management and treatment of HD. The strategy used to search for evidence was based on application of electronic sources such as MEDLINE, PubMed, Cochrane Review Library, CINAHL, and EMBASE.These guidelines are inclusive and not prescriptive.The recommendations were defined and graded based on the current levels of evidence and in accordance with the criteria adopted by American College of Chest Physicians. The recommendations were graded A, B, and C.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 31993837 · DOI · PMC7005095

Comparison of stapled haemorrhoidopexy with traditional excisional surgery for haemorrhoidal disease (eTHoS): a pragmatic, multicentre, randomised controlled trial [2]

Randomized controlled trial Watson AJ, Hudson J, Wood J, Kilonzo M, Brown SR, McDonald A, et al. · · 2016 · cited 85 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
BackgroundTwo commonly performed surgical interventions are available for severe (grade II-IV) haemorrhoids; traditional excisional surgery and stapled haemorrhoidopexy.
Closing excerpt
FundingNational Institute for Health Research Health Technology Assessment programme.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (330 words)

BackgroundTwo commonly performed surgical interventions are available for severe (grade II-IV) haemorrhoids; traditional excisional surgery and stapled haemorrhoidopexy. Uncertainty exists as to which is most effective. The eTHoS trial was designed to establish the clinical effectiveness and cost-effectiveness of stapled haemorrhoidopexy compared with traditional excisional surgery.MethodsThe eTHoS trial was a large, open-label, multicentre, parallel-group, pragmatic randomised controlled trial done in adult participants (aged 18 years or older) referred to hospital for surgical treatment for grade II-IV haemorrhoids. Participants were randomly assigned (1:1) to receive either traditional excisional surgery or stapled haemorrhoidopexy. Randomisation was minimised according to baseline EuroQol 5 dimensions 3 level score (EQ-5D-3L), haemorrhoid grade, sex, and centre with an automated system to stapled haemorrhoidopexy or traditional excisional surgery. The primary outcome was area under the quality of life curve (AUC) measured with the EQ-5D-3L descriptive system over 24 months, assessed according to the randomised groups. The primary outcome measure was analysed using linear regression with adjustment for the minimisation variables. This trial is registered with the ISRCTN registry, number ISRCTN80061723.FindingsBetween Jan 13, 2011, and Aug 1, 2014, 777 patients were randomised (389 to receive stapled haemorrhoidopexy and 388 to receive traditional excisional surgery). Stapled haemorrhoidopexy was less painful than traditional excisional surgery in the short term and surgical complication rates were similar between groups. The EQ-5D-3L AUC score was higher in the traditional excisional surgery group than the stapled haemorrhoidopexy group over 24 months; mean difference -0·073 (95% CI -0·140 to -0·006; p=0·0342). EQ-5D-3L was higher for stapled haemorrhoidopexy in the first 6 weeks after surgery, the traditional excisional surgery group had significantly better quality of life scores than the stapled haemorrhoidopexy group. 24 (7%) of 338 participants who received stapled haemorrhoidopexy and 33 (9%) of 352 participants who received traditional excisional surgery had serious adverse events.InterpretationAs part of a tailored management plan for haemorrhoids, traditional excisional surgery should be considered over stapled haemorrhoidopexy as the surgical treatment of choice.FundingNational Institute for Health Research Health Technology Assessment programme.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 27726951 · DOI · PMC5269572

Risk Factors for Hemorrhoids on Screening Colonoscopy [3]

Research article Peery AF, Sandler RS, Galanko JA, Bresalier RS, Figueiredo JC, Ahnen DJ, et al. · · 2015 · cited 67 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
BackgroundConstipation, a low fiber diet, sedentary lifestyle and gravidity are commonly assumed to increase the risk of hemorrhoids.
Closing excerpt
High grain fiber intake and sedentary behavior are associated with a decreased risk of hemorrhoids.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (242 words)

BackgroundConstipation, a low fiber diet, sedentary lifestyle and gravidity are commonly assumed to increase the risk of hemorrhoids. However, evidence regarding these factors is limited. We examined the association between commonly cited risk factors and the prevalence of hemorrhoids.MethodsWe performed a cross sectional study of participants who underwent a colonoscopy in a colorectal adenoma prevention trial and who had a detailed assessment of bowel habits, diet and activity. The presence of hemorrhoids was extracted from the subjects' colonoscopy reports. We used logistic regression to estimate odds ratios and 95% confidence intervals while adjusting for age and sex.ResultsThe study included 2,813 participants. Of these, 1,074 had hemorrhoids recorded. Constipation was associated with an increased prevalence of hemorrhoids (OR 1.43, 95% CI 1.11, 1.86). Of the fiber subtypes, high grain fiber intake was associated with a reduced risk (OR for quartile 4 versus quartile 1 = 0.78, 95% CI 0.62, 0.98). We found no association when comparing gravid and nulligravida women (OR 0.93, 95% CI 0.62-1.40). Sedentary behavior was associated with a reduced risk (OR 0.80, 95% CI 0.65-0.98), but not physical activity (OR 0.83, 95% CI 0.66-1.03). Neither being overweight nor obese was associated with the presence of hemorrhoids (OR 0.89, 95% CI 0.72-1.09 and OR 0.86, 95% CI 0.70-1.06).ConclusionsConstipation is associated with an increased risk of hemorrhoids. Gravidity and physical activity do not appear to be associated. High grain fiber intake and sedentary behavior are associated with a decreased risk of hemorrhoids.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 26406337 · DOI · PMC4583402

Worldwide prevalence of haemorrhoids: a systematic review and meta-analysis [4]

Meta-analysis Esmaeilnia Shirvani A, Pakdaman K, Maleki Z, Soraneh S, Rezaei Chegini F, Pakdaman K, et al. · · 2026 · cited 7 times (Europe PMC)

Abstract reading summary — source excerpts
Opening excerpt
BackgroundHaemorrhoidal disease (HD) is one of the most common anorectal disorders globally, significantly impacting individuals' quality of life and productivity.
Closing excerpt
These findings underscore the importance of targeted prevention and early intervention strategies, especially for at-risk groups.
Interpretation limits
Verbatim excerpts from the authors’ abstract; the closing excerpt may describe a finding, limitation or recommendation. Design, population, effect size and uncertainty have not been independently extracted or appraised. Read the complete abstract and linked paper before interpreting the findings.
Read complete abstract (280 words)

BackgroundHaemorrhoidal disease (HD) is one of the most common anorectal disorders globally, significantly impacting individuals' quality of life and productivity. Despite its importance, global prevalence remains unclear due to limited population-specific studies. This study aimed to systematically assess the global prevalence of HD through a systematic review and meta-analysis.MethodsWe conducted a systematic review and meta-analysis by searching PubMed, Scopus, Embase, Web of Science, and Google Scholar up to March 31, 2025, without language restrictions. Studies reporting prevalence of haemorrhoids in general, clinical, or high-risk populations were included. Exclusion criteria comprised studies lacking total sample size, focusing on other anorectal conditions, or using duplicate or insufficient data. Four independent reviewers extracted and appraised study quality using the Joanna Briggs Institute tool. The primary outcome was pooled point prevalence of HD, analyzed using a random-effects model with 95% confidence intervals (CIs). The study was registered in PROSPERO (CRD420251045600).ResultsFrom 6,312 records, 150 studies (210 datasets) comprising 8,960,338 individuals were included. The global pooled point prevalence was 25.92% (95% CI: 22.62-29.22). Lifetime prevalence was 27.19% (95% CI: 14.77-39.60), and one-year prevalence was 21.65% (95% CI: 14.33-28.97). Prevalence was higher in women (27.33%, 95% CI: 21.84-32.82) than in men, and highest in the African region 28.07% (95% CI: 15.34-40.79). Invasive diagnostic methods (28.05%, 95% CI: 23.86-32.26) yielded higher prevalence estimates than non-invasive methods. Also, factors showing associations with HD in unadjusted analyses include older age, obesity, pregnancy, diabetes, family history, constipation, and hypertension.ConclusionHD remains a prevalent condition globally, with minor variation across regions. The burden is consistent regardless of socioeconomic context. Diagnostic method and population characteristics influence prevalence estimates. These findings underscore the importance of targeted prevention and early intervention strategies, especially for at-risk groups.

Abstract reproduced from the open-access article under the recorded cc by licence; © the authors. PMID 41450176 · DOI · PMC12777808

Key reviews and meta-analyses

The most cited review-type papers among PubMed’s best-match results for this heading, listed with bibliographic details only. Follow the links for the full text and access terms.

  • Research article Hemorrhoids: from basic pathophysiology to clinical management [5]
    Lohsiriwat V · World J Gastroenterol · 2012 · cited 288 times (Europe PMC)
  • Research article Haemorrhoids: pathology, pathophysiology and aetiology [6]
    Loder PB, Kamm MA, Nicholls RJ, Phillips RK · Br J Surg · 1994 · cited 186 times (Europe PMC)
  • Research article The American Society of Colon and Rectal Surgeons Clinical Practice Guidelines for the Management of Hemorrhoids [7]
    Davis BR, Lee-Kong SA, Migaly J, Feingold DL, Steele SR · Dis Colon Rectum · 2018 · cited 179 times (Europe PMC)
  • Research article Treatment of hemorrhoids: A coloproctologist's view [8]
    Lohsiriwat V · World J Gastroenterol · 2015 · cited 147 times (Europe PMC)
  • Research article Systematic review and network meta-analysis comparing clinical outcomes and effectiveness of surgical treatments for haemorrhoids [9]
    Simillis C, Thoukididou SN, Slesser AA, Rasheed S, Tan E, Tekkis PP · Br J Surg · 2015 · cited 121 times (Europe PMC)
  • Research article Transanal hemorrhoidal dearterialization: a systematic review [10]
    Giordano P, Overton J, Madeddu F, Zaman S, Gravante G · Dis Colon Rectum · 2009 · cited 116 times (Europe PMC)

References

  1. Gallo G, Martellucci J, Sturiale A, Clerico G, Milito G, Marino F, et al.. Consensus statement of the Italian society of colorectal surgery (SICCR): management and treatment of hemorrhoidal disease. . 2020. PMID 31993837 · DOI · PMC7005095
  2. Watson AJ, Hudson J, Wood J, Kilonzo M, Brown SR, McDonald A, et al.. Comparison of stapled haemorrhoidopexy with traditional excisional surgery for haemorrhoidal disease (eTHoS): a pragmatic, multicentre, randomised controlled trial. . 2016. PMID 27726951 · DOI · PMC5269572
  3. Peery AF, Sandler RS, Galanko JA, Bresalier RS, Figueiredo JC, Ahnen DJ, et al.. Risk Factors for Hemorrhoids on Screening Colonoscopy. . 2015. PMID 26406337 · DOI · PMC4583402
  4. Esmaeilnia Shirvani A, Pakdaman K, Maleki Z, Soraneh S, Rezaei Chegini F, Pakdaman K, et al.. Worldwide prevalence of haemorrhoids: a systematic review and meta-analysis. . 2026. PMID 41450176 · DOI · PMC12777808
  5. Lohsiriwat V. Hemorrhoids: from basic pathophysiology to clinical management. World J Gastroenterol. 2012. PMID 22563187 · DOI · PMC3342598
  6. Loder PB, Kamm MA, Nicholls RJ, Phillips RK. Haemorrhoids: pathology, pathophysiology and aetiology. Br J Surg. 1994. PMID 7922085 · DOI
  7. Davis BR, Lee-Kong SA, Migaly J, Feingold DL, Steele SR. The American Society of Colon and Rectal Surgeons Clinical Practice Guidelines for the Management of Hemorrhoids. Dis Colon Rectum. 2018. PMID 29420423 · DOI
  8. Lohsiriwat V. Treatment of hemorrhoids: A coloproctologist's view. World J Gastroenterol. 2015. PMID 26309351 · DOI · PMC4541377
  9. Simillis C, Thoukididou SN, Slesser AA, Rasheed S, Tan E, Tekkis PP. Systematic review and network meta-analysis comparing clinical outcomes and effectiveness of surgical treatments for haemorrhoids. Br J Surg. 2015. PMID 26420725 · DOI
  10. Giordano P, Overton J, Madeddu F, Zaman S, Gravante G. Transanal hemorrhoidal dearterialization: a systematic review. Dis Colon Rectum. 2009. PMID 19690499 · DOI

About this article

Sources
NLM Medical Subject Headings (definition, synonyms); NCBI PubMed (counts, identifiers); Europe PMC (open-access abstracts and citation counts).
Verification
Every reference was resolved against PubMed on 2026-10-31; title, year and DOI matched.
Review state
automated source verified; no human expert review has been recorded yet.
Version
1, last updated 2026-10-29.

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At a glance

5,898
PubMed records on this heading
12%
published since 2020
529
review articles
570
randomized trials
10
verified references below

Counts come from PubMed on 2026-10-29; they show how much has been written, not how strong the evidence is.

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