The vagus nerve and the oesophagus pass through the diaphragm together, threading through the same narrow opening — the oesophageal hiatus. When a hiatal hernia pushes the stomach upward through this gap, it does not just cause acid reflux; it can mechanically irritate or compress the vagal trunks that run alongside the oesophagus. This anatomical proximity is why hiatal hernias can produce symptoms that seem to have nothing to do with digestion — palpitations, chest pain, breathlessness, and episodes that mimic cardiac emergencies.
Anatomy at the Hiatus
The oesophageal hiatus is an opening in the right crus of the diaphragm, roughly two to three centimetres in diameter, through which the oesophagus descends into the abdomen. The anterior vagal trunk (derived primarily from the left vagus nerve) lies on the front surface of the oesophagus, while the posterior vagal trunk (derived primarily from the right vagus nerve) runs behind it. Both trunks pass through the hiatus bound to the oesophagus by the phrenoesophageal ligament — a fold of fascia and peritoneum that anchors the gastro-oesophageal junction at the level of the diaphragm.
Below the hiatus, the anterior trunk gives off the hepatic branch (supplying the liver and biliary system) and the anterior gastric branches (innervating the stomach’s lesser curvature and pylorus). The posterior trunk sends the large celiac branch to the coeliac plexus (providing vagal input to the small intestine, colon, pancreas, and kidneys) and the posterior gastric branches. This branching pattern means that vagal irritation at the hiatus can produce symptoms referable to any of these downstream territories.
Types of Hiatal Hernia
Type I (sliding) hernias account for roughly 95 percent of cases: the gastro-oesophageal junction slides upward through the hiatus, carrying the cardia of the stomach into the thorax. The vagal trunks are stretched rather than compressed, and intermittent herniation produces intermittent symptoms. Type II (paraesophageal) hernias are less common but anatomically more concerning: the gastric fundus herniates alongside the oesophagus while the gastro-oesophageal junction remains in place, potentially compressing the vagal trunks between the herniated stomach and the diaphragmatic crura. Types III (mixed) and IV (large defect with herniation of other organs) carry the highest risk of both vagal compromise and surgical emergency.
Your local vagus nerve experts
Find a vagus nerve practitioner near you
Our directory lists 2,685 practitioners across the US, from polyvagal-informed therapists to HRV biofeedback clinics.
Or browse by approach
- Osteopathy and visceral manipulation
- Acupuncture
- Polyvagal-informed therapy
- Somatic therapy
- HRV biofeedback
- Craniosacral therapy
The directory covers the United States for now. Listings come from practitioners’ own websites and are not endorsements or medical advice. Browse the full directory.
Roemheld Syndrome: When the Stomach Mimics the Heart
Roemheld syndrome — also called gastrocardiac syndrome — describes cardiac symptoms triggered by gastrointestinal distension, and hiatal hernia is one of its most common associations. The mechanism is vagal: gastric distension activates mechanosensitive vagal afferents that project to the nucleus of the solitary tract (NTS) in the medulla. The NTS also receives cardiovascular afferents and projects to the dorsal motor nucleus of the vagus, which controls cardiac vagal output. Gastric distension can therefore trigger reflexive bradycardia, ectopic beats, or vasovagal episodes via this shared brainstem circuitry.
Patients with Roemheld syndrome typically report palpitations, chest tightness, breathlessness, dizziness, or anxiety after meals — particularly large meals or those producing significant gas. Lying down after eating or bending forward may worsen symptoms by increasing upward pressure on the hernia. These presentations frequently lead to cardiac investigations — ECG, echocardiography, stress testing — that return normal results, because the heart itself is structurally sound. The problem is vagal afferent signalling from the stomach, not intrinsic cardiac disease. A 2024 review documented the gut-heart axis mechanisms underlying these gastrocardiac interactions.
Other Vagal Symptoms from Hiatal Hernia
Beyond cardiac-type symptoms, hiatal hernia can produce a range of vagally mediated complaints. Chronic cough and throat clearing can result from irritation of the superior laryngeal nerve (a vagal branch) by refluxate reaching the laryngopharynx. Excessive salivation (water brash) reflects vagal stimulation of the salivary glands. Early satiety and nausea occur when the hernia disrupts normal gastric accommodation — the vagally mediated relaxation of the gastric fundus that allows the stomach to expand during a meal. In severe cases, a large paraesophageal hernia can contribute to gastroparesis by mechanically disrupting vagal motor input to the gastric body and antrum.
Diagnosis and Evaluation
Hiatal hernia is diagnosed by upper gastrointestinal endoscopy (which also evaluates for reflux oesophagitis and Barrett’s oesophagus), barium swallow (which demonstrates the hernia dynamically, particularly useful for paraesophageal hernias), or CT scanning. When vagally mediated cardiac symptoms are a concern, 24-hour Holter monitoring can correlate cardiac rhythm changes with meals and postural changes. Gastric emptying scintigraphy may be indicated if gastroparesis symptoms are present — retention of more than 10 percent of a standardised meal at four hours confirms delayed emptying. High-resolution oesophageal manometry evaluates lower oesophageal sphincter pressure and oesophageal motility, both of which are influenced by vagal function.
Management: Protecting the Vagal Trunks
Conservative management focuses on reducing gastric distension and reflux: smaller, more frequent meals; avoiding eating within three hours of lying down; elevating the head of the bed; weight management; and proton pump inhibitors to reduce acid exposure. For Roemheld syndrome specifically, reducing gas-producing foods, treating any concurrent small intestinal bacterial overgrowth, and using simethicone or digestive enzymes can decrease the gastric distension that triggers vagal cardiac symptoms.
Surgical repair — typically laparoscopic fundoplication (Nissen or Toupet) with hiatal closure — is reserved for cases with refractory symptoms, large paraesophageal hernias, or complications such as volvulus or incarceration. During surgery, identification and preservation of the vagal trunks is critical. Inadvertent vagal injury during anti-reflux surgery is a recognised cause of post-surgical gastroparesis, occurring in up to 10 percent of fundoplication procedures in some series. Vagal-sparing surgical techniques and intraoperative nerve identification reduce this risk.
Want to understand the broader connections between your vagus nerve and your digestive, cardiac, and immune systems? Get My Vagus Nerve & Me eBook for the complete guide to this essential nerve.
