CausesBy Mayo Clinic staff
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A hiatal hernia occurs when weakened muscle tissue allows your stomach to bulge up through your diaphragm. It's not always clear why this happens, but pressure on your stomach may contribute to the formation of hiatal hernia.
How a hiatal hernia forms
Your diaphragm is a large dome-shaped muscle that separates your chest cavity from your abdomen. Normally, your esophagus passes into your stomach through an opening in the diaphragm called the hiatus. Hiatal hernias occur when the muscle tissue surrounding this opening becomes weak, and the upper part of your stomach bulges up through the diaphragm into your chest cavity.
Possible causes of hiatal hernia
Hiatal hernia could be caused by:
- Injury to the area
- Being born with an unusually large hiatus
- Persistent and intense pressure on the surrounding muscles, such as when coughing, vomiting, or straining during a bowel movement or while lifting heavy objects
- Brady MF. Hiatal hernia. In: Ferri FF. Ferri's Clinical Advisor 2012: 5 Books in 1. Philadelphia, Pa.: Mosby Elsevier; 2012. http://www.mdconsult.com/books/about.do?about=true&eid=4-u1.0-B978-0-323-05611-3..C2009-0-38601-8--TOP&isbn=978-0-323-05611-3&uniqId=291436269-101. Accessed Oct. 17, 2011.
- Jeyarajah R, et al. Abdominal hernias and gastric volvulus. In: Feldman M, et al. Sleisenger & Fordtran's Gastrointestinal and Liver Disease: Pathophysiology, Diagnosis, Management. 9th ed. Philadelphia, Pa.: Saunders Elsevier; 2010. http://www.mdconsult.com/books/about.do?eid=4-u1.0-B978-1-4160-6189-2..X0001-7--TOP&isbn=978-1-4160-6189-2&about=true&uniqId=229935664-2192. Accessed Oct. 17, 2011.
- Keifer D. Gastroesophageal reflux disease. In: Rakel D. Integrative Medicine. 2nd ed. Philadelphia, Pa.: Saunders Elsevier; 2007. http://www.mdconsult.com/das/book/body/162991320-4/0/1494/0.html. Accessed Oct. 17, 2011.
- Heartburn or gastroesophageal reflux disease (GERD). The American College of Gastroenterology. http://www.acg.gi.org/patients/women/whatisgerd.asp. Accessed Oct. 17, 2011.