What causes burping?

Burping can be caused by not having enough acid in your stomach. If you do not have enough then that can gas and indigestion. Second, it could be not having enough bile which will cause indigestion and gas. Third, the pancreas not having enough enzymes will cause incomplete digestion. You would know it's gallbladder if you experience right shoulder pain, headache, extended abdomen. Sometimes combination of food can cause burping. Take apple cider vinegar to help to increase stomach acid to help.