Bellyache/ˈbelieɪk/ Definition 1 of 3Pro Tip 1/3Physical Discomfort Used to describe actual stomach pain. After dinner, I had a bad bellyache. Pro Tip 2/3Mild Severity 'Bellyache' often implies discomfort that is not extremely severe. A bit of ginger tea can soothe your bellyache. Pro Tip 3/3Not Medical Term It's informal and less precise than medical terms like 'gastritis' or 'abdominal pain'. If the bellyache persists, you might need a doctor.