This is termed hiatal hernia. Hiatal hernia is believed to be caused by this weakening of the anchoring tissues of the gastroesophageal junction to the diaphragm, perhaps due to increased pressure within the abdomen such as sometimes results from obesity or trauma. While some people are born with a hernia, factors such as stress, heavy lifting, or the normal wear and tear of life can cause the opening to enlarge, allowing the stomach to protrude into the chest. This can cause the valve between the stomach and the esophagus to fail, causing severe heartburn. Even children may have the problem.
Some persons do inherit the tendency for heartburn.
If your heartburn persists, you need to consult a physician . If you're having symptoms you can't distinguish from a heart problems.