Burping is often considered a "faux pas," as it can be embarrassing and off-putting, especially in social situations.
But for some, the inability to belch can be an issue that can cause discomfort. There is even a medical name for the condition: retrograde cricopharyngeal dysfunction (R-CPD), also known as "no burp syndrome."
The cricopharyngeus is the main muscle of the upper esophageal sphincter, the top gate of the food pipe. With no burp syndrome, this muscle does not relax, which interferes with the burping process...