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. 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. Belching that happens because of swallowed air can be caused by: eating too fast. drinking too fast. drinking a lot of carbonated beverages. smoking. chewing gum. Belching is often accompanied by .

why do i rarely burp