what is reflux

Reflux, also known as acid reflux, is a condition in which stomach acid flows back into the tube connecting the mouth and stomach (esophagus). This can cause symptoms such as heartburn, regurgitation of food or sour liquid, chest pain, trouble swallowing, and a sensation of a lump in the throat. When this condition becomes more severe and long-lasting, it is referred to as gastroesophageal reflux disease (GERD), which can lead to complications over time, such as damage to the esophagus, pharynx, or respiratory tract