Burping or belching is most often caused by
swallowed air, usually while eating or drinking.
Burping that occurs with other symptoms, such as pain, heartburn, nausea, a
decreased appetite, or weight loss, may have a more serious cause.
Gallstones or another problem with the
gallbladder may cause burping that is worse after eating and occurs with pain
in the upper right abdomen that spreads to the back or