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How can heartburn happen?

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Heartburn is when stomach acids irritate your esophagus. Usually, a muscular valve called the lower esophageal sphincter keeps stomach acid in the stomach. But if the value opens too often or doesn’t close tight enough, stomach acid can reflux, or seep, back into the esophagus and cause a burning feeling.

From: Pregnancy and Heartburn WebMD Medical Reference

SOURCE: American Pregnancy Association.

Reviewed by Nivin Todd on October 16, 2018

SOURCE: American Pregnancy Association.

Reviewed by Nivin Todd on October 16, 2018

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How common is heartburn?

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