You know the feeling: that burning sensation in your chest after a meal – the one that sends you running for the Tums. Most of us suffer from this discomfort, commonly called heartburn, from time to time. Truth is, more than 60 million of us experience heartburn at least once a month, and about 25 million suffer from it on a daily basis. But if heartburn has become a regular complaint, you may have the digestive disorder known as gastro-esophageal reflux disease, or GERD.