Heartburn - After you eat or drink, it's normal for your stomach to produce acid to help digestion. But certain things like overeating, eating too fast, spicy or fatty foods, alcohol and tobacco can result in excess acid. That's what causes sour stomach, stomach upset (acid indigestion) or the burning sensation (heartburn) that starts in the stomach and moves up through the upper chest into the throat. Other symptoms include general discomfort and an uncomfortable feeling of fullness; all these symptoms can interfere with everyday activities.
In most cases, acid indigestion and heartburn can be reduced in frequency or stopped altogether by simple changes in diet, lifestyle, and the use of antacids or acid controllers.
Heartburn symptoms occur when acid moves from its natural place in the stomach up into the food pipe or esophagus, causing burning pains. Heartburn can be felt as a burning pain under the breastbone or at the bottom of the esophagus.