R-CPD (Retrograde Cricopharyngeal Dysfunction): The inability to burp

R-CPD (retrograde cricopharyngeal dysfunction) is a condition in which you cannot burp because the upper esophageal sphincter (the cricopharyngeus muscle) does not relax when air needs to escape upward. The air becomes trapped in the esophagus and stomach, causing gurgling sounds, bloating, and flatulence. The condition was first described by Bastian and Smithson in 2019, and according to the Danish medical journal Ugeskrift for Læger, the first Danish patient was treated in 2021. R-CPD is highly treatable with an injection of botulinum toxin (Botox) directly into the muscle.

What symptoms does R-CPD cause?

The primary symptom is the inability to burp—often with patients having never been able to do so, even as children. In addition, most people experience:

• Gurgling or "croaking" sounds from the throat and chest (especially after eating or drinking)
• Severe bloating and abdominal distension
• Chest tightness and pressure
• Excessive flatulence (as the trapped air must find its way through the entire digestive tract)
• Painful hiccups
• Discomfort when consuming carbonated beverages

These symptoms typically worsen in social situations and can significantly impact a patient's quality of life, even though the condition itself is medically harmless.

Why can't you burp with R-CPD?

A normal burp occurs when air from the stomach rises into the esophagus, causing it to expand. In response, the upper esophageal sphincter automatically relaxes, allowing the air to escape through the throat.

In R-CPD, this relaxation reflex fails. The cricopharyngeus muscle remains tightly closed when air approaches from below, trapping it in the esophagus. Interestingly, the muscle functions perfectly normally when you swallow food or liquids—the dysfunction only occurs when air attempts to move in the opposite direction, hence the name retrograde cricopharyngeal dysfunction.

Can R-CPD be confused with other conditions?

Yes. Many people with R-CPD are misdiagnosed for years with conditions like acid reflux, GERD, or Irritable Bowel Syndrome (IBS), because bloating and flatulence dominate the clinical picture.

The key distinguishing feature of R-CPD is the absolute inability to burp, combined with the characteristic gurgling sounds in the throat. Part of our evaluation is to rule out these other gastrointestinal causes to ensure you receive the correct diagnosis and treatment.

How is R-CPD diagnosed?

The diagnosis is made primarily through a detailed medical history, as the classic pattern of symptoms is highly recognizable. According to medical guidelines, the evaluation includes a thorough ear, nose, and throat (ENT) examination, alongside a flexible endoscopic evaluation of the pharynx and larynx (laryngoscopy).

This exam is typically entirely normal, but its main purpose is to rule out any other structural causes for your symptoms. There is no specific blood test or imaging scan that can diagnose R-CPD on its own.

How is R-CPD treated?

R-CPD is treated with an injection of botulinum toxin (Botox) into the cricopharyngeus muscle. The Botox temporarily relaxes the muscle, allowing trapped air to pass through and restoring the natural ability to burp.

The procedure is performed under general anesthesia through the mouth and takes only a short time. Afterward, you may experience mild, temporary side effects, such as slight difficulty swallowing (transient dysphagia) or a mild sore throat, which typically resolve within a few weeks as the Botox takes effect. This treatment is well-documented in both Danish and international clinical studies.

How well does the treatment work?

In a Danish study published in Ugeskrift for Læger, more than half of the patients achieved a highly satisfactory result after their first injection, while approximately one-third required a second treatment with a higher dose.

Side effects were mild and temporary—primarily mild difficulty swallowing and a sore throat—with no serious complications reported. While the physical effect of the botulinum toxin naturally wears off after a few months, the vast majority of patients permanently retain their ability to burp, as the brain "re-learns" the natural reflex.

When should you seek medical attention?

You should consider consulting an ENT specialist if you rarely or never burp and are bothered by gurgling sounds, chronic bloating, chest pressure, or increased flatulence—especially if these symptoms disrupt your daily life, meals, or social activities. Many individuals with R-CPD have suffered for years without knowing their condition has a name and is easily treatable.

Note: If you experience persistent difficulty swallowing, pain, or unexplained weight loss, you should always be evaluated promptly to rule out other underlying conditions.

Treatment at Charlottenlund Private Hospital

At Charlottenlund Privathospital, we have been treating R-CPD for many years, making it one of our highly specialized areas of expertise within ENT surgery.

Your journey begins with an initial consultation with one of our ENT specialists, who will review your symptoms, examine your throat, and determine if botulinum toxin therapy is the right solution for you. The procedure is performed under general anesthesia, and we arrange a follow-up appointment (typically by phone) to assess your progress. You do not need a referral to book an appointment.



Sources:

- Retrograde cricopharyngeal dysfunction. Weekly Journal for Doctors (status article). weeklyjournal.dk

- Retrograde cricopharyngeal dysfunction management with botulinum toxin A. Danish Medical Journal / Ugeskrift for Læger (2025). ugeskriftet.dk

- Bastian RW, Smithson ML. Inability to belch and associated symptoms due to retrograde cricopharyngeus dysfunction: diagnosis and treatment (2019).