Heartburn, Acid Reflux, And GERD: Definition
A heartburn is a burning sensation/discomfort you feel in your throat when gastric juices splash back into the esophagus. Although commonly interchanged with acid reflux, heartburns are mild while acid reflux is much stronger.
Acid reflux occurs in an almost similar way as heartburn; only that acid reflux is more intense with lots of gastric juices and enzymes finding the way into the throat.
These enzymes and acid cause an intense burning sensation that makes it almost impossible for one to ingest anything.