• Clinical science

Hiatal hernia


A hiatal (or hiatus) hernia is the abnormal protrusion of any abdominal structure/organ, most often a portion of the stomach, into the thoracic cavity through a lax diaphragmatic esophageal hiatus. It may be congenital or secondary to ageing, obesity, and/or smoking. There are four types of hiatal hernia: sliding, paraesophageal, mixed, and complex. Sliding hiatal hernias, where the gastroesophageal junction (GEJ) and the gastric cardia migrate into the thorax, account for 95% of hiatal hernias. In paraesophageal hernias (PEH), only the gastric fundus herniates into the thorax, whereas in mixed hiatal hernias, the GEJ as well as the gastric fundus herniate. Complex hiatal hernias are rare and characterized by protrusion of any abdominal organ other than the stomach. Nearly half of all patients with hiatal hernia are asymptomatic and require no medical or surgical intervention. Symptomatic patients with sliding hiatal hernia present with features of gastroesophageal reflux disease (GERD), which are usually managed with lifestyle modification and proton pump inhibitors. Patients with PEH or mixed hiatal hernias typically present with intermittent dysphagia, substernal discomfort, or abdominal pain, and in rare cases present acutely with gastric volvulus and strangulation. All symptomatic PEH, mixed, and complex hiatal hernias require operative intervention to avoid life-threatening complications. Also see our article “Congenital diaphragmatic hernias”.


Protrusion of any abdominal structure/organ into the thorax through a lax diaphragmatic esophageal hiatus. (In 95% of cases, a portion of the stomach is herniated.)


  • Incidence increases with:
    • Age: affects ∼ 70% of people > 70 years
    • BMI
  • Prevalence
    • More prevalent in females and Western populations
    • Most commonly occur on the left side, as the liver protects the right diaphragm.


Epidemiological data refers to the US, unless otherwise specified.




Types of hiatal hernias

Type I: sliding hiatal hernia

Type II: paraesophageal hiatal hernia

Type III: mixed hiatal hernia

  • Mix of types I and II
  • The GEJ and a portion of the gastric fundus prolapse through the hiatus.

Type IV: complex hiatal hernia

  • Herniation of any abdominal structure other than the stomach (e.g., spleen, omentum, or colon)
  • Rarest type




Changes in the presence of a hiatal hernia


Clinical features

  • Most patients are asymptomatic
  • Type I: symptoms of GERD
  • Type II, III, and IV:
    • Epigastric/substernal pain
    • Early satiety
    • Retching
    • Symptoms of GERD can occur.
  • Saint triad: a combination of cholelithiasis, diverticulosis, and hiatal hernia may occur in ∼ 1.5% of patients.



  • Barium swallow: most sensitive test
    • Assesses type and size of a hernia (including location of the stomach and the GEJ) (see “Classification” above)
  • Endoscopy: used to diagnose hiatal hernia and evaluate for possible complications (see “Complications” below)
    • Z-line: squamocolumnar junction, which represents the transition from the squamous epithelium-lined esophageal mucosa to the columnar epithelium-lined gastric mucosa; corresponds to the GEJ
      • Types I and III: Z-line lies above the diaphragmatic hiatus
      • Types II and IV: Z-line remains undisplaced (below the diaphragmatic hiatus)
  • Other tests that can detect hiatal hernias include:




Management of patients with sliding hiatal hernia

Management of patients with types II, III, IV hiatal hernias

  • Conservative management: older patients or those with other comorbidities
  • Surgery: laparoscopic/open herniotomy + fundoplication, hiatoplasty, and gastropexy/fundopexy
    • Indications
      • Asymptomatic, small hernias in patients < 50 years of age
      • Symptomatic type II, III, IV hernias



Complications of type I

Complications of type II, III, IV

The complications of types II, III, and IV are often medical emergencies!References:[4][9][3]

We list the most important complications. The selection is not exhaustive.

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  • 2. Burkitt DP; James PA. Low-residue diets and hiatus hernia. Lancet. 1973; 302(7821): pp. 128–130. doi: 10.1016/S0140-6736(73)93067-5.
  • 3. Kohn GP, Price RR, Demeester SR et al. Guidelines for the Management of Hiatal Hernia. https://www.sages.org/publications/guidelines/guidelines-for-the-management-of-hiatal-hernia. Updated April 1, 2013. Accessed January 12, 2017.
  • 4. Kahrilas PJ. Hiatus hernia. In: Post TW, ed. UpToDate. Waltham, MA: UpToDate. https://www.uptodate.com/contents/hiatus-hernia. Last updated July 25, 2016. Accessed January 13, 2017.
  • 5. Munteanu AC, Munteanu M, Surlin V, Dilof R. Upside-down stomach and hiatal hernia [in Romanian]. Chirurgia. 2012; 107(3): pp. 399–403. pmid: 22844842.
  • 6. Johnson LF. 24-hour pH monitoring in the study of gastroesophageal reflux. J Clin Gastroenterol. 1980; 2(4): pp. 387–399. pmid: 7347370.
  • 7. Hauer-jensen M, Bursac Z, Read RC. Is herniosis the single etiology of Saint's triad?. Hernia. Hernia. 2009; 13(1): pp. 29–34. doi: 10.1007/s10029-008-0421-x.
  • 8. Stylopoulos N, Gazelle GS, Rattner DW. Paraesophageal hernias: operation or observation?. Ann Surg. 2002; 236(4): pp. 492–500. url: https://www.ncbi.nlm.nih.gov/pmc/articles/PMC1422604/.
  • 9. Weston AP. Hiatal hernia with cameron ulcers and erosions. Gastrointest Endosc Clin N Am. 1996; 6(4): pp. 671–679. pmid: 8899401.
  • Herold G. Internal Medicine. Cologne, Germany: Herold G; 2014.
last updated 11/05/2020
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