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Some medical conditions can cause very foul smelling gas, such as irritable bowel syndrome and inflammatory bowel disease. However, these conditions bring with them other symptoms that are difficult to ignore, such as diarrhea, change in appearance of stools, abdominal cramps and sometimes abdominal pain.
Even if they have not eaten the foods above, people with intestinal conditions like Crohn's Disease and irritable bowel syndrome may experience burps that smell like sulphur. According to Healthline, certain bacteria and parasites, such as Helicobacter pylori and giardia, can also cause belching.