Acid reflux can affect people of all ages, sometimes for unknown reasons. It may happen due to a lifestyle factor, but also due to causes that cannot always be prevented. Acid reflux causes heartburn, a burning sensation that happens when some of the acid content of the stomach flows up into the esophagus. Frequent acid reflux may be a sign of GERD. Although people may use the terms interchangeably, heartburn is a symptom of acid reflux, also knownTrusted Source as gastroesophageal reflux (GER). Despite the name, heartburn has nothing to do with the heart.
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