Hiatal Hernia

What is a Hiatal hernia?

A hiatal hernia occurs when the stomach protrudes through the esophageal hiatus of the diaphragm into the thoracic cavity. Sliding hiatal hernias can impair the antireflux barrier and are often associated with gastroesophageal reflux disease (GERD), but many hiatal hernias are asymptomatic. Prevalence increases significantly with age. It is estimated that over 60% of adults older than 60 years possess some degree of herniation.

The most common variant is the sliding hiatal hernia, which accounts for approximately 95% of cases. In this type, the gastroesophageal junction and a portion of the stomach move upward into the chest, often intermittently. Less common but more clinically concerning is the paraesophageal hiatal hernia, where the gastroesophageal junction remains in its normal position while a portion of the stomach fundus rolls up alongside the esophagus. This latter type carries a higher risk of serious complications like strangulation.

What causes a Hiatal hernia?

Hiatal hernia causes involve a combination of age-related tissue changes and persistent mechanical stress. Over time, the phrenoesophageal membrane (the connective tissue anchoring the esophagus to the diaphragm) loses its elasticity and becomes lax. This weakening, combined with a widening of the diaphragmatic hiatus, creates a path for the top of the stomach to migrate into the mediastinum.

Internal pressure also plays a significant role in the development of the defect. Elevated intra-abdominal pressure from obesity, pregnancy, or chronic straining during bowel movements can force abdominal contents upward. Additionally, conditions that cause a “short esophagus,” such as chronic inflammation and scarring from severe reflux, can physically pull the stomach toward the chest.

What are the signs and symptoms of a Hiatal hernia?

Heartburn and regurgitation are the most common symptoms in sliding hiatal hernia, whereas paraesophageal hernias more often cause postprandial fullness, chest or epigastric pain, nausea, retching, or other mechanical symptoms. Some individuals also experience retrosternal chest pain or dysphagia (difficulty swallowing), particularly when a larger portion of the stomach compresses the distal esophagus. The severity of these symptoms often correlates with the size and type of the defect.

A large paraesophageal hiatal hernia may present with more mechanical symptoms, such as postprandial fullness or early satiety. Chronic mechanical trauma to the stomach as it slides through the hiatus can result in linear gastric erosions known as Cameron lesions, which may lead to iron deficiency anemia. The most severe presentation involves an incarcerated or strangulated hernia, characterized by sudden, intense chest pain and vomiting, which constitutes a medical emergency.

How is a Hiatal hernia diagnosed?

Upper endoscopy (esophagogastroduodenoscopy) is the gold standard for diagnosis because it allows for direct visualization of the mucosal lining and the diaphragmatic impression. During this procedure, the clinician can measure the axial separation of the gastroesophageal junction and identify complications such as esophagitis or Cameron lesions. A barium swallow is particularly useful for defining hernia anatomy and is the most sensitive test for type II or III paraesophageal hernias.

Advanced diagnostic tools are used to refine the treatment plan, especially prior to surgical intervention. Esophageal manometry assesses the rhythmic muscle contractions of the esophagus to rule out other motility disorders. Ambulatory pH monitoring can quantify acid exposure for those whose symptoms do not resolve with standard therapy. If acute complications like a gastric volvulus (twisting of the stomach) are suspected, a CT scan of the chest and abdomen provides the necessary anatomical detail for emergency management.

How is a Hiatal hernia treated?

Initial management for mild cases focuses on lifestyle modifications to reduce intra-abdominal pressure and acid exposure. Patients are advised to lose weight, eat smaller meals, and avoid lying down for several hours after eating. For symptomatic relief, proton pump inhibitors (PPIs) or H2 blockers suppress gastric acid secretion and promote healing of reflux-related esophagitis.

Surgical intervention is generally reserved for refractory GERD in sliding hiatal hernia and for symptomatic paraesophageal hiatal hernias or acute complications such as volvulus, obstruction, strangulation, perforation, or bleeding. Modern surgical repair typically involves a laparoscopic approach to reduce the hernia, perform a cruroplasty (narrowing the diaphragmatic opening), and complete a fundoplication to recreate the anti-reflux valve. Emergency surgery is mandatory for any case of gastric volvulus or strangulation to restore blood flow and prevent tissue necrosis.

What are the most important facts to know about Hiatal hernias?

• A hiatal hernia involves the protrusion of the stomach into the chest, a condition that becomes increasingly common as people age.
• While the sliding hiatal hernia is the most frequent type and primarily causes reflux, paraesophageal types are more prone to dangerous twisting.
• Core symptoms include heartburn and regurgitation, but large hernias can lead to iron deficiency anemia via Cameron lesions.
• Diagnosis often relies on barium swallow, upper endoscopy, or both, depending on the suspected subtype and whether surgical planning is needed.
• Management ranges from acid-suppressing medications and lifestyle changes to surgical repair for those at risk for obstruction or strangulation.