New to SIBO Canada? Small Intestinal Bacteria Overgrowth (SIBO) is a serious condition affecting the small intestine. It occurs when bacteria that normally grow in other parts of the gut start growing in the small intestine. That causes pain and diarrhea. It can also lead to malnutrition as the bacteria start to use up the body’s nutrients. Studies have indicated that potentially up to 80% of patients with IBS may in fact have SIBO. Common symptoms and reasons to test for SIBO: nausea, flatulence, diarrhea, constipation, malnutrition, IBS, IBD, leaky gut syndrome, chronic fatigue, acid reflux, rosacea, restless leg syndrome, fibromyalgia, GERD, celiac disease, and diverticulitis.