Indigestion — also called dyspepsia or an upset stomach — is a general term that describes discomfort in your upper abdomen. Indigestion is not a disease, but rather some symptoms you experience, including abdominal pain and a feeling of fullness soon after you start eating. Although indigestion is common, how you experience indigestion may differ from other people. Symptoms of indigestion may be felt occasionally or as often as daily.
Indigestion can be a symptom of another digestive disease. Indigestion that isn't caused by an underlying disease may be eased with lifestyle changes and medication.