What causes a burp?

When we eat, we swallow air with our food. Our stomach already has air in it from bacteria that produces gas and from chemical reactions caused by digestive enzymes. When there is too much air to fit in our stomach, we force some out in what we call a “burp.” It’s funny that something considered impolite occurs so naturally.

Where does ear wax come from?Ask a Doctor:Is a healthy person's temperature always 98.6ºF?


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