what causes non stop burping?
You can find a list of causes of excessive burping in this article – http://www.healthhype.com/causes-of-excessive-belching-burping-and-bloating.html
Common causes include air swallowing and excessive consumption of carbonated beverages. However a number of gastrointestinal conditions may also be responsible. Burping on its own without other symptoms may not be pathological but you speak to your doctor to have this investigated further.