Different root causes of abdominal pain include, however are not limited to, acid indigestion after eating, gallstones and gallbladder swelling (cholecystitis), pregnancy, gas, inflammatory bowel disease (ulcerative colitis and Crohn's disease), appendicitis, abscess, gastritis, gastroesophageal reflux disease (GERD), pancreatitis, gastroenteritis (bacterial or viral), parasite infection, endometriosis, kidney stones (nephrolithiasis), stomach muscle injury, abdominal rupture, lactose intolerance, gluten intolerance (celiac illness), gastrointestinal disorder, menstrual aches, peritonitis, serositis, ischemic bowel illness, vasculitis, stomach aneurysm, stomach body organ injury from injury, as well as irregular bowel movements. Gastritis is a basic medical term for any kind of light irritation, swelling or infection of the stomach cellular lining. Acute gastritis occurs as an abrupt attack that can last from a few hrs to a couple of days. Chronic gastritis, which is fairly common among the elderly, can happen over a long period as well as might generate comparable signs or light pain, along with loss of appetite as well as queasiness. If you create a hurting or stabbing pain or stress in the upper abdominal area simply under the ribs, this might indicate a heart-related problem, states Kristine Arthur, MD, internist at Orange Coastline Memorial Medical Center in Water Fountain Valley, CA.