There is a condition called Small Intestinal Bacterial Overgrowth that fits this description. There is even an antibiotic that is marketed toward and prescribe

There is a condition called Small Intestinal Bacterial Overgrowth that fits this description. There is even an antibiotic that is marketed toward and prescribed for the condition called Xifaxan / rifaximin. Neomycin (another antiobiotic) is also used to treat it. This research lab is studying it and this doctor (Pimentel) has written a book about it: http://www.cedars-sinai.edu/Research/Research-Labs/Pimentel-Lab/ http://www.cedars-sinai.edu/Research/Research-Labs/Pimentel-...