Acid reflux occurs when the sphincter muscle at the lower end of your esophagus relaxes at the wrong time, allowing stomach acid to back up into your esophagus this can cause heartburn and other signs and symptoms frequent or constant reflux can lead to gastroesophageal reflux disease (gerd). Reflux gastric. Acid reflux is a condition in which acid backs up from the stomach into the esophagus and even up to the throat, irritating their lining tissuesacid reflux can be aggravated by many different things, including lifestyle, medication, diet, pregnancy, weight gain, and certain medical conditions symptoms of acid reflux include heartburn, regurgitation of bitter acid into the throat, bitter.
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