Why Do We Burp?
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By Sally Robertson, BSc
Burping is usually a normal bodily process that enables air to be brought up and released from the stomach. This produces a distinctive sound. Although burping is perfectly natural, it can cause embarrassment and discomfort.
Every time a person swallows fluid or food, air is also swallowed. Excess air may be swallowed when an individual eats or drinks too quickly, talks while they are eating, smokes, sucks on hard sweets, chews gum, or drinks fizzy drinks, for example. The unconscious swallowing of air is referred to as aerophagia.
http://www.news-medical.net/health/Why-Do-We-Burp.aspx
