When it finally arrives in the large intestine, all nutritional value has been spent, and the only remaining process is the removal of water before final elimination. Diseases of the Upper GI Tract Return to top Reflux esophagitis is characterized by heartburn, upper abdominal or chest pain, difficulty swallowing, nausea, or belching that leaves an acid taste. It is caused by a backflow of acid stomach contents into the esophagus. Symptoms usually occur within an hour after eating, and are most likely to strike when you lie down, bend, or stoop. It is alleviated by taking antacids or sitting up.
Severe cases can lead to a narrowing of the esophagus requiring medical therapy.
The digestive tract's convoluted course begins at the mouth, ending yards later at the rectum. In between lie the esophagus, stomach, and small and large intestines. Each segment is vulnerable to a characteristic set of afflictions, ranging from gastritis, gastroenteritis, and ulcers in the upper tract to colitis, diverticulosis, and colon cancer in the lower segments. Liquid antacids are effective for immediate relief of heartburn. Since almost anything that increases pressure in the abdomen can cause heartburn, long-term therapy involves ways of reducing that pressure.