Acid reflux disease is caused by an abnormal level of acid in the stomach's contents. Studies have shown that normal individuals have reflux as often as people with acid refulx disease, but that in normal individuals the stomach contents are not as acidic and do not stay in the esophagus as long.
Certain existing conditions make a person susceptible to acid reflux. This is especially true during pregnancy. The hormone levels during pregnancy can cause reflux by lowering the pressure in the lower sphincter of the esophagus. Additionally, the fetus can put pressure on the abdomen. People with diseases that stress the esophageal muscles are also more susceptable to acid reflux disease.
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