Gas as well as appendicitis are simply 2 of several conditions that can create abdominal discomfort. The brain connects with the rest of the body via the nerves, which has a number of significant elements. One of them is the enteric nervous system, which assists regulate digestion. In life-or-death scenarios, the brain sets off the "battle or flight" response. It slows food digestion, and even quits it entirely, so the body can concentrate every one of its internal power to facing the threat.