Functional Gut Clinic leaflet

A hydrogen and methane breath test  is used to detect abnormal growth of bacteria in the small intestine or small intestinal bacterial overgrowth (SIBO) which can cause a variety of symptoms including diarrhoea, nausea, bloating,  gas and abdominal cramps. A hydrogen and methane breath test  is used to detect abnormal growth of bacteria in the small intestine or small intestinal bacterial overgrowth (SIBO) which can cause a variety of symptoms including diarrhoea, nausea, bloating, gas and abdominal cramps.