Esophageal motility disorders & gastro-esophageal reflux disease

Understanding diseases of the esophagus and esophagogastric junction

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Its main function is to move food and fluids to the stomach, while preventing food or fluids from regurgitating. Such one-way flow depends on precise coordination between two muscular valves, the upper and lower esophageal sphincters, and the esophageal wall’s ability to contract in a downward (aboral) direction. All of this is regulated by signals from both the brain and an intricate network of nerves within the digestive system.

Gastro-esophageal reflux disease (GERD) is an extremely common condition, but the underlying causes are still not fully understood. While some cases are tied to anatomical issues, like hiatal hernias, others involve a weak or malfunctioning lower esophageal sphincter. Most often, the reasons for this failure, although the physiological effects are well documented, remain unknown. 

Esophageal Structure & Motor Function

The esophagus is a tube-like structure composed of both striated (voluntary) and smooth (involuntary) muscles that connect the throat (oropharynx) to the stomach.

The esophagus is positioned in the retrocardiac space and is bound proximally by the upper esophageal sphincter and distally by the lower esophageal sphincter. The esophagus is innervated by both parasympathetic and sympathetic divisions of the autonomic nervous system via the esophageal plexus, with motor innervation primarily from the vagus nerve and sympathetic fibers from the sympathetic trunk and interface with the myenteric plexus.

The vagus nerve provides motor control, while sensory innervation comes from the vagus, glossopharyngeal, and laryngeal nerves.

Woman sitting on bed clutching chest with eyes closed suggesting chest discomfort or pain in a home setting

Symptoms of esophageal motility disorders & GE reflux

You Might Experience Symptoms Of:

  • Heartburn and acid reflux – A burning sensation in the chest, often after eating
  • Regurgitation – Stomach contents rising back into the throat or mouth
  • Dysphagia (difficulty swallowing) – Food feeling stuck in the chest
  • Chest pain – Especially after eating
  • Chronic cough or throat irritation – Often mistaken for allergies or postnasal drip
  • Feeling full too quickly or bloating – Even after small meals
Man reclining on couch with hand on chest suggesting chest discomfort or possible heart related symptoms

What causes esophageal dysmotility

Esophageal dysphagia is defined as the perception that food or fluids are not able to pass from the oral cavity to the stomach. Excluding obstructive etiologies, such as a stricture or a neoplasm, we can categorize esophageal dysphagia into four categories:
  • Distal esophageal spasm, i.e. achalasia
  • Hypercontractility of the overall esophagus, i.e. diffuse esophageal spasm
  • Ineffective esophageal peristalsis, i.e. simultaneous or contractions with abnormal latency gradient
  • Absent contractility

More complex motility disorders usually stem from problems in regard to how the esophageal nerves signal contractions.

This signaling is regulated by the brainstem and the enteric nervous system, including a structure called the myenteric plexus (a network of nerves embedded in the gut wall). It acts like a built-in control center for digestion, ensuring that muscles contract in the right order to move food downstream.

Person with red hair and glasses covering mouth while holding ice cream cone suggesting nausea or feeling unwell after eating

What causes gastroesophageal reflux disease

Gastro-esophageal reflux disease (GERD) is defined as excessive retrograde movement of acid or bile-containing gastric secretions into the esophagus. GERD may be due to:

High Frequency Of Transient Lower Esophageal Sphincter Relaxations

Diminished Resting LES Pressure

Abnormal Pressure At The EG Junction Due To Its Orad Displacement Above The Diaphragmatic Hiatus With Loss Of Pressure From The Crural Diaphragm

In the presence of one or several of these conditions, pathological regurgitation from the stomach to the esophagus may occur, with or without aspiration, with mucosal injury and elicitation of pain. Key factors in the generation of symptoms are mucosal barrier function, expression and sensitivity of sensory nerves, and CNS modulation, which itself may be further affected various psychosocial comorbidities.

What current research & clinical pathways suggest

Ongoing efforts in the study of esophageal motility disorders and reflux disease continue to refine how these conditions are diagnosed, categorized, and managed. As our understanding of the esophageal nervous system and sphincter physiology deepens, so too does the potential for more targeted interventions, both medical and procedural.


Current areas of investigation are intended to define better frameworks for classifying motility disorders, understanding the nervous system’s role in the regulation of esophageal function, and identifying therapeutic windows that may reduce reliance on long-term acid suppression or invasive procedures.

Professional Associations

Esophageal motility & gastroesophageal reflux: Frequently Asked Questions

Is gastroesophageal reflux always caused by too much acid?
No, that’s a common misconception. Gastroesophageal reflux is more often caused by the abnormal structural or functional features of the lower esophagus, the lower esophageal sphincter, or the diaphragmatic crus, than by excess acid (or bile) production.
Yes. Some people have what’s called “silent reflux,” which shows up as a chronic cough, hoarseness, throat clearing, or postnasal drip without the classic burning sensation in the chest or throat.
Reflux is the act of stomach contents backing up into the esophagus, which can occur normally in most individuals. GERD (gastroesophageal reflux disease) is the chronic, more severe form that may require evaluation and long-term treatment.
That can be a sign of esophageal dysmotility, a condition where the muscles that move food don’t contract properly, or an actual stricture. These possibilities can be discovered with studies of esophageal anatomy and function.
Not necessarily, but it can contribute to reflux, problems swallowing, or chest pain. However, if it’s large or positioned next to the esophagus (i.e. paraesophageal hernia) rather than in line with the esophagus, or if the hernia is causing severe symptoms, it may need to be addressed with an endoscopic or surgical treatment.
If medications haven’t fully relieved your symptoms, or if your quality of life is significantly affected after the institution of medications, it may be time to look deeper at both the anatomy and function of your esophagus and esophago-gastric junction.

Physicians usually start with proton pump inhibitors (PPIs) or histamine type 2 blockers (H2 blockers), and monitor their effectiveness and side effects, with the goal of using the lowest effective dose possible for achieving symptom relief.

Newer classes of medication include:

1) potassium-competitive acid blockers (P-CABs), such as Vonoprazan, which have been FDA approved since 2023-2024 for erosive and non-erosive esophagitis, and 2) anti-pepsin drugs, such as Fosamprenavir, which are currently undergoing clinical trials.

It’s a test that tracks how much acid is coming into your esophagus over a few days. It may be introduced either with a catheter or a temporarily implanted sensor applied to the esophageal wall during an endoscopy. Either method is minimally invasive and are well tolerated by patients.

Esophageal manometry measures the pressure and movement of the esophageal wall inside your esophagus during swallowing. If you’re having trouble swallowing or experience unexplained chest pain, this test can be key for diagnosing the problem.

An alternative test, available in some facilities, is the EndoFLIP (Endoluminal Functional Lumen Imaging Probe), a procedure performed under sedation or during an endoscopy, which assesses the structure and function of the esophagus and esophago-gastric junction by measurement of esophageal wall distensibility.

Not at all. There are newer, minimally invasive procedures that tighten or support the LES using endoscopic access.

These include:

1) Transoral incisionless fundoplication (TIF), in which a device is used to create a partial wrap around the lower esophagus

2) Stretta procedure, in which radiofrequency energy is delivered to the lower esophageal sphincter to promote thickening of the esophageal tissue

3) Endoscopic plication, in which sutures may be placed around the LES to increase resistance to flow

In addition, experimental methods for treating severe GERD include those that enact local mucosal resection or ablation to promote scar formation, or ultrasound guided stapling to promote sphincter tightening. Fundoplication surgery is generally reserved for cases where the anatomy is particularly complex, such as a large hiatal hernia, and only after other options have been explored.

Esophageal POEM (peroral endoscopic myotomy) is a procedure used to treat achalasia and other severe motility disorders and can be life-changing for people with esophageal muscle dysfunction. The procedure involves the creation of a tunnel between the layers of the esophageal wall, followed by cutting of the muscles linked to the esophageal sphincter.
Stress or any other psychological factors can make symptoms worse, but it’s rarely the root cause. If your symptoms are persistent or worsening, they deserve a full workup.

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