Burping is a condition not a disease. It can be due to some problems some where else. You have not mentioned your sex an since long you are having this. The burping due eating of egg, milk and fried things and even with water can be due to pregnancy. It can also attributed to eating very fast and swallowing half chewed food. Carbonated drinks also cause this problem. So I advise you to visit a doctor for proper diagnosis of your cause.