Acid that is normally in your stomach backs up into the esophagus, tube that carries food from your mouth to your stomach.
The esophagus is the tube that carries food from the throat to the stomach. However, it is not just a simple tube. The lower esophagus has a specialized muscle around it that usually stays tightly closed, opening only to allow food and liquid into the stomach. It acts to prevent the reflux of stomach acid into the esophagus.
Symptoms occur when this specialized muscle weakens and allows stomach acid to splash up into the esophagus. These symptoms include heartburn, chest discomfort, and bitter fluid flowing up into the mouth. Chest discomfort can occur. If the stomach juice trickles into the breathing tubes, hoarseness, cough, and even shortness of breath can occur. This entire problem is called GERD (Gastroesophageal Reflux Disease). A number of factors, including certain foods, may cause the lower esophageal muscle to relax, causing GERD. More information on a GERD diet can be located in the Patient Information tab under the heading GI Diets.