MIRIAM MASLO / SCIENCE PHOTO LIBRARY MIRIAM MASLO / SCIENCE PHOTO LIBRARY
Heartburn. Conceptual image representing heartburn, showing flames down a patient's oesophagus (gullet) and stomach (bottom right). Heartburn is a burning pain caused by stomach acids escaping into the oesophagus, burning its lining. This is due to failure of the stomach's cardiac sphincter, which separates the stomach from the oesophagus, to close properly.
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