Dyspepsia is the medical term for an upset stomach or acid indigestion. Pain or discomfort in the upper belly after eating is the most common sympton; gas and bloating can increase that discomfort.
In some cases, patients can experience heartburn. Heartburn occurs when acid from the stomach backs up into the more sensitive tissue of the esophagus. Chronic heartburn should not be ignored. If you are experiencing heartburn more than twice per week, you may have GERD.
For more information, see below.