What Is SIBO? Bacteria are generally found in large intestines, where they perform various symbiotic functions for the body. SIBO is a condition where bacterial overgrowth occurs in the small intestines, typically producing following symptoms, Bloating and /or wind Abdominal pain and cramping Halitosis Burping and Acid Reflux IBS diarrhoea/constipation Food sensitivities Joint pain Skin rashes