What organ is damaged by heartburn?

The esophagus, which is the tube that carries food and drink down your throat and into your stomach. When heartburn occurs, it is usually because there is acid activity at the base of the esophagus, which causes the burning feeling. It can also be because of a gas buildup or bubble, or even by previous irritations in the esophagus. Mostly though it is due to stomach acid bubbling up into the esophagus and causing irritation, which can become inflamed and irritated and prolong the burning. In severe cases this acid irritation has been known to turn into ulcers, and even cancer. At the first sign of heart burn take an antacid or drink something to coat your esophagus, as it takes the hardest beating.