pain localization in common abdominal conditions

appendicitis

right lower quadrant (direct); around navel (referred); rebound tenderness (pain felt on the rebound after palpation)

cholecystitis

right upper quadrant (direct); right shoulder (referred)

ulcer

upper mid abdomen or upper part of back

diverticulitis

left lower quadrant

abdominal aortic aneurysm (ruptured or dissecting)

low part of back and lower quadrants

cystitis (inflammation of the bladder)

lower mid abdomen (retropubic)

kidney infection

costovertebral angle

kidney stone

right or left flank, radiating to genitalia

pancreatitis

upper abdomen (both quadrants); back

hernia

anywhere in the abdominal area

peritonitis

diffuse abdominal pain area