R-CPD

At the bottom of your throat, just behind the lower edge of the voice box, there is a ring of muscle called the cricopharyngeus. It is the upper sphincter of the esophagus. It stays squeezed shut almost all the time and opens for about a second each time you swallow¹. It is also meant to open the other way for a moment, when air rises out of the stomach and needs to leave as a burp.

In R-CPD that second job fails. The muscle opens normally for swallowing but will not relax to let air back out, so the air stays trapped below it^2,3. The esophagus then pushes the air back down. That is thought to be where the gurgling, the bloating and the extra gas come from, although the exact mechanism has not been proven³.

It was first described, in a single patient, in 1987^4,5, and then named and given a treatment in 2019 by Robert Bastian, a laryngologist².

People with R-CPD often report being unable to burp for as long as they can remember. In the first group of 51 patients, 50 said they had been unable to burp for as long as they could remember².

After eating or drinking, especially anything fizzy, there is pressure in your chest or upper belly that a burp would fix, and the burp does not come. Instead there are noises: gurgling, croaking or squeaking from the bottom of the neck and the chest. Patients in that first study compared them to frogs and dinosaurs². Your stomach swells as the day goes on, and the gas leaves the other way, often through the evening and into the night⁶.

Many people also find it hard or impossible to throw up⁷, and in one survey 80% reported painful hiccups⁸. It usually starts in childhood³. In a survey of 199 people from the r/noburp community, the typical answer was that the symptoms caused real embarrassment and anxiety, and 90% disagreed that they had received adequate help⁷.

From A-CPD. Same muscle, opposite direction. In A-CPD the sphincter does not open well for food going down, so pills and solid food catch at the bottom of the throat. In R-CPD swallowing is normal. Only air coming up is blocked^1,9. The ages are different too. R-CPD usually begins in childhood and gets diagnosed in the late twenties or thirties^3,10. A-CPD is mostly found in older adults. In a study of 250 people with a tight cricopharyngeus, most of whom also had a Zenker's pouch, the mean age was 69¹¹.

From reflux. Heartburn and acid can come with R-CPD as well. Across studies, reflux disease was found in somewhere between 16 and 52 percent of people with R-CPD¹². That overlap is part of why it gets missed: about a third of people in a 2026 survey said a doctor had put their symptoms down to reflux⁸.

From achalasia. People with achalasia often have trouble belching too, up to 85% in older reports¹³. But achalasia makes food and drink stick in the chest and come back up undigested, and it usually begins in adulthood¹⁴. R-CPD on its own does not make food stick.

Mostly from the story of your symptoms. In a review of 17 studies, most diagnosed R-CPD from symptoms alone, and only 3 groups also used manometry³. A survey of US laryngologists found that they mainly treat it as a clinical diagnosis¹⁵.

Bastian's approach is to diagnose from the pattern of symptoms and let the treatment act as the test: improvement after a clinician-administered injection can support the diagnosis alongside a medical assessment².

Tests do exist. High-resolution impedance manometry while you drink something fizzy can show the sphincter staying shut as gas rises^5,16. Endoscopy and swallow studies are used mainly to rule other things out, and in one pooled review none of them explained the symptoms¹⁷.

The person to ask for is an ear, nose and throat doctor, ideally a laryngologist, who treats R-CPD. The community-run site noburp.info keeps a directory of clinicians¹⁸.

The standard treatment is Botox (botulinum toxin) injected into the cricopharyngeus. It weakens the muscle for a few months so that air can get out².

• Under general anesthesia. Bastian's original method. A short anesthetic, a rigid scope through the mouth, and usually 50 units injected at several points in the muscle².
• Awake, in clinic. Through the skin of the neck, guided by electromyography (EMG), which records the muscle’s electrical activity^10,19.
• Under sedation. Through a flexible endoscope passed down the throat²⁰.

Starting doses in published studies ranged from 10 to 100 units, and 50 was the most common¹⁷. Many people keep the ability to burp after the drug has worn off. In a series of 200 patients, 79.9% of those who were helped could still burp six months or more after a single injection²¹. If symptoms return, the injection can be repeated. A small number of people have a myotomy instead, which cuts the muscle, usually with a laser through the mouth^1,17.

• It works quickly for most people. Pooled across 13 case series with 699 patients, 91% had relief within one to four weeks (95% CI 84 to 96)²². The 2025 systematic review reports 92.5% immediate success³.
• For most, it lasts. Across studies with mean follow-up periods ranging from 3 to 29 months, sustained relief was 80% (95% CI 71 to 87)²². In the review, symptoms came back in 9.5% of patients in the first month, 12.6% between one and five months, and 27.9% after six months³.
• The usual side effect is temporary trouble swallowing. 31.1% in the systematic review³ and 51% in the meta-analysis (95% CI 38 to 64)²². In one clinic series it lasted 16 days on average¹⁰.
• Most people find the name themselves. In the 5 studies that recorded how the diagnosis was made, patients had recognised it themselves in 78.9% of cases³. In a French series of 106 patients, 99.1% had worked it out themselves after a combined 162 medical visits. Their symptoms started at a mean age of 13.6 and they were diagnosed at a mean age of 30.4¹⁰.
• How sure we can be. There are no randomized trials. Apart from one small study with an untreated comparison group, every study is a case series or a survey, and the review authors judged all of them at risk of bias³. In that comparison study, 92% of treated patients could burp at three months, against none of 7 untreated controls²⁰.

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Our ClinicalTrials.gov search found no studies listed as recruiting or not yet recruiting for R-CPD on 8 October 2026. Other studies may exist. See the trials for the other four conditions.