SIBO is an under-recognised condition. People with SIBO often reports symptoms similar to IBS (see above), including bloating or feeling full after eating, abdominal pain, loose stools and weight loss. There is an increase in the number of bacteria in the small intestine, which causes the symptoms. This can happen after certain types of operations, be an adverse effect of some medications, or other conditions which slow movement through the gastrointestinal tract.