What is Acid Reflux? Food Items That Trigger The Acid Reflux ? Acid reflux is a common condition that features a burning pain, known as heartburn, in the lower chest area. It happens when stomach acid flows back up into the food pipe. If acid reflux symptoms happen more than twice a week, you may have acid reflux disease, also known as gastroesophageal reflux disease (GERD). We all get the...