Small intestinal bacterial overgrowth (SIBO) is a newer diagnosis that means bacteria from the colon have migrated into the small intestine. The most common symptoms are bloating and irregular stools, and it is usually diagnosed with a hydrogen breath test. It can be caused by excessive starch intake and apparently food poisoning (such as campylobacter).
Most fascinating to me is the possible correlation being made between SIBO and other diseases, such as:
Atherosclerosis (hardening of arteries):
SIBO may be caused by poor gallbladder function, involving poor bile flow:
Levothyroxine (synthetic thyroid T4 medication) might cause SIBO, according to this study:
H. Pylori may contribute to SIBO (methane production):