Sulfur burps are burps that have a foul, rotten egg smell due to the presence of hydrogen sulfide gas in the gut. This gas may be a byproduct of digestion or the result of an underlying digestive issue. Different causes may lead to sulfur burps, including:

• Eating certain foods: H2S is produced when bacteria in the oral cavity and gastrointestinal tract break down food. Certain foods may cause excessive belching or sulfur burps, including beans and legumes, broccoli, brussel sprouts, cauliflower, garlic, dairy products, milk, and beer.
• Excessive alcohol use: Alcohol consumption may disrupt effective digestion in the body and lead to stomach acid reflux, which may influence sulfur burps.
• Carbonated beverages: Reducing carbonated drinks, including soda and sparkling water, may help cut burps.
• Sugary foods: Sugar may feed the bacteria in the gut that causes H2S sulfide gas to build up. Avoiding sugary foods may be enough to reduce symptoms in some people.
• Large meals: Eating large meals may cause sulfur burps.

Sulfur burps are typically harmless, but if your burping becomes excessive, it could be a sign of an underlying digestive issue. There are several conditions that can cause burps that smell like sulfur, including bacterial infections like Helicobacter pylori and giardia infection. If you suspect you have an underlying medical condition or if the sulfur burps are accompanied by concerning symptoms like pain in your chest or digestive tract, weight loss, fever, nausea and vomiting, or diarrhea, see your doctor. The best way to prevent sulfur burps is to find out what is causing them. Keeping a journal about your foods and daily habits can be an effective way to isolate the cause of your sulfur burps.