Acid reflux is a common condition that can be caused by a variety of factors, including diet, lifestyle, and medical conditions. Although acid reflux can be uncomfortable and inconvenient, it is usually not serious and can be managed with lifestyle changes and over-the-counter medications. Acid reflux occurs when the esophageal sphincter, a muscle at the base of the esophagus, does not close properly. This allows stomach acid and other contents of the stomach to flow back up into the esophagus, causing GERD symptoms. Common GERD symptoms include heartburn, chest pain, regurgitation, and difficulty swallowing. Other associated symptoms may include a sour taste in the mouth, excessive salivation, and coughing. Dietary and lifestyle modifications are the first line of treatment for acid reflux. Avoiding trigger foods, such as spicy or fatty foods, and eating smaller, more frequent meals can help reduce symptoms. Gastroesophageal reflux disease (GERD) is a condition in which stomach acid and other contents of the stomach flow back up into the esophagus, causing heartburn and other symptoms.