Heartburn is a medical malady which is evident in the form of an unpleasant burning sensation under the sternum and breastbone. Contrary to its name, this condition is associated to the upper part of the digestive system rather than to the heart. Medically, heartburn is referred to as pyrosis. Such a burning sensation arises when the gastric acids flow into your esophagus because of an inappropriate opening of the cap or lid of your stomach or lower esophageal sphincter muscle. Normally, these LES muscles remain closed after the food gets into your stomach to collect food bolus or acids. However, due to certain factors, the LES muscles get slacken and because of this acid reflux which contains pepsin and hydrochloric acid may lead to burning sensations in the esophagus coating and cause chest pain.
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