A member asked:

What causes having vomit in burps?

A doctor has provided 1 answer

Burping or vomiting?: The vomiting reflex is controlled by two units in the brain medulla--one receives nerve impulses from the GI tract, the other is a chemical receptor. Both have nerve connections to not only the GI tract (pharynx, mesenteric vessels, bile ducts) but also from brain corticobulbar areas that mediate smells, sights, & taste. Thus, vomiting apparatus responds to a variety of GI & brain inputs.

Answered 7/12/2014

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