Gastroesophageal reflux disease (GERD) is one of the most common digestive problems worldwide. In India, 20-30% of the population is said to suffer from the condition. GERD or acid reflux occurs when stomach acids constantly flow back into the esophagus, which is the tube that connects your mouth to the stomach. The repeated backwash irritates the lining of your esophagus, also called the lower esophageal sphincter (LES).