It is the sensation of increased abdominal pressure due to the accumulation of gases. When they spend more time than they should in the digestive tract, food becomes overly fermented by intestinal bacteria, which results in an excessive accumulation of gases. That causes a feeling of bloating. In addition, these gases have two ways to escape: 1) go up through the esophagus and burp out, or 2) follow the path of the digestive system and exit in the form of flatulence. Even so, belching is a less frequent symptom during indigestion.