If you have a lot of burping and it smells like rotten eggs what's going on?

Rotten egg burps: The smell of sulfur (sulphur) or rotten egg burps comes from hydrogen sulfide (H2S), a gas originating from sulfur-containing proteins in some foods after they are broken down by sulfur-reducing microbes. These microbes may be normal intestinal bacteria or pathogenic bacteria. Ref: http://www.healthhype.com/sulphur-or-rotten-eggs-burps-belching-foul-smelling-gas.html