Small intestinal bacterial overgrowth (SIBO) is a condition in which your small bowel has a higher number of microbes than are normally present inside your gut. Multiple disorders can predispose or be responsible for this abnormality, including anatomic changes inside your bowel from a previous surgery, medication use, or slow motility of your bowel, for example due to diabetes. Symptoms from SIBO are often gas, bloating, abdominal discomfort, or diarrhea. More severe symptoms like oily, bulky stool and weight loss could also be present. Vitamin deficiencies can occur. A simple, non-invasive breath test is available to diagnose the disease and several antibiotics could treat the condition. Similarly, it is important to identify the underlying predisposing factors and treat them when possible to prevent it from happening again. For that, an upper endoscopy or a colonoscopy could be performed as needed.