Sulfur burps are belches that have a strong rotten egg smell. One cause of these burps is eating foods high in sulfur. The first thing to do to attempt to eliminate these burps is to avoid eggs, dairy, legumes and many preservatives. It may only be one certain food that is causing the belching. Try eliminating foods containing sulfur for a few days. After the belching has stopped, introduce the foods back into the diet one at a time.
There are some medications that also contain sulfur. Check all prescriptions to see if they could be the cause. A dose of Pepto Bismol may also help relieve these smelly burps. Do not take this medication for more than two or three weeks at a time, as stated on Healthhype.
Celiac disease also causes sulfur burps. Reducing gluten and wheat based foods may help calm the symptoms.
If none of these options stop the belching or if it is belching and flatulence, a bigger problem may exist. See a doctor to determine what may be the cause, which could be: