Indigestion, also known as upset stomach or dyspepsia, is discomfort or a burning feeling in the upper abdomen, often accompanied by nausea, abdominal bloating, belching, and sometimes vomiting.
In normal digestion, the lower esophageal sphincter (LES) opens to allow food to pass into the stomach and closes to prevent food and acidic stomach juices from flowing back into the esophagus. Gastroesophageal reflux occurs when the LES is weak or relaxes inappropriately, allowing the stomach's contents to flow up into the esophagus..
To diagnose indigestion, the doctor may perform tests for problems, like ulcers. In the process of diagnosis, a person may have x-rays of the stomach and small intestine, or an endoscopy, in which the doctor uses an instrument to look at the inside of the stomach.
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