If you are consistently experiencing acid reflux or heartburn, it may be a sign of GERD. GERD occurs when the lower esophageal sphincter (LES), a muscle at the bottom of the esophagus that acts as a barrier between the esophagus and stomach, fails to function properly. This can result in stomach acid flowing back into the esophagus, leading to irritation and discomfort. While occasional heartburn is common and not usually a cause for worry, frequent heartburn or acid reflux occurring more than twice a week could be indicative of GERD. It is important to take note of these symptoms to prevent potential complications associated with GERD.