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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.
In about one-third of people, however, intestinal gas also contains another ingredient: methane. 1  It's unclear why some people's bodies produce methane and others do not. One way to tell if you have methane in your gas is to look at your stool: people who produce methane typically will have stools that float in water. Sulfur is the substance that causes gas to have its distinctive odor.