Abdominal pain isn't always INSIDE the abdomen. Mayo Clinic Connect has a section on anterior cutaneous nerve entrapment syndrome (A.C.N.E.S.), a condition which causes severe pain in the abdominal WALL. Gastroenterology is the wrong specialty for A.C.N.E.S. It's often in the right upper quadrant area and deserves mention for patients who have negative findings after a gastroenterologic workup.