8-Acid taste in the mouth
This symptom occurs when the person has heartburn and implies an unpleasant sensation of acidic taste in the oral cavity. Although they are not the same condition, sometimes someone with indigestion can suffer simultaneously from heartburn. It also causes pain in the center of the chest, neck, and back after eating. It occurs when the valve that separates the esophagus from the stomach does not close properly; thus, the stomach acid rises through the pharynx and reaches the throat.