Readings & Meanings:
Today, my stomach's been hurting since morning.
Recently I've been having gastrointestinal problems.
胃 and お腹. They both mean "stomach". What's the difference?
胃 means stomach, but refers to the organ.
お腹 mean stomach, but refer to the abdomen, the general area.
Think of the 田 as a crosshair and the 月 as your "moon" or your ass. Therefore 胃 targets the organ above your ass.