My fiancé burps all day long. He doesn't even have to drink anything. Is there something wrong with his stomach?

Burping champ. Involuntary belching after a meal is normal, caused by release of swallowed gas after distension of the stomach with food. Magenblase syndrome is postprandial epigastric fullness & bloating, relieved by belching.Aerophagia (accumulation of gas due to air swallowing) is common with anxiety, hypersalivation from gum chewing, smoking, drinking, oral irritation. In some, belching can become habitual.
Reflux disease? Excessive burping can be a sign of gerd (gastro-esophageal reflux disease).