The abdomen is the section of the human body below the ribcage and above the pelvis (hips). It has no other bones except the spine. It contains several important body organs, such as the stomach, liver, kidneys, pancreas, small intestine, spleen and, in women, the ovaries and uterus.
Because the abdomen contains so many body structures, abdominal pain is a very signicant symptom, but does not assist much in a diagnosis unless it can be localized to a specific organ. For example, acid reflux, gallstones and ulcers can all cause pain in the same area. For this reason, radiological investigation is usually required for a definitive diagnosis.