The condition is caused by a malfunctioning cricopharyngeus muscle, which essentially acts as a gate between the esophagus and the throat. The muscle stays tightly closed but opens while swallowing

Ulcers. 2 /14. Sometimes, burping can be a sign of stomach ulcers. These open sores in the lining of your stomach are quite common. An infection can cause them. So can taking too many NSAIDs

What causes burping? "When we swallow food or drinks, it goes through a tube called the esophagus and into the stomach," explains Dr. Schneider. "It's there that stomach acid and digestive enzymes work to break food down into nutrients that we use for energy. Gas is created in this process." We can also swallow air along with food or drinks.
Why do people burp? We burp to release gas that builds up in our stomachs during the digestion of food, when food is breaking down, or because we have swallowed air. Signs of no-burp syndrome. No-burp syndrome is easy to identify. Almost 100% of people who self-diagnose and make an appointment with Pitman do indeed have the syndrome.
Inability to burp or belch occurs when the upper esophageal sphincter ( cricopharyngeus muscle) cannot relax in order to release the "bubble" of air. The sphincter is a muscular valve that encircles the upper end of the esophagus just below the lower end of the throat passage.
While burping is natural and expected, excessive burping—especially if accompanied by other symptoms—could signal an underlying health issue like acid reflux, gastritis, or IBS.
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why do i rarely burp