Regurgitation of food or sour liquid is a symptom of gastrointestinal issues such as acid reflux or gastroesophageal reflux disease (GERD). It occurs when stomach contents flow back up into the esophagus, causing a feeling of burning in the chest or throat, and a sour or bitter taste in the mouth. This regurgitation may also include undigested food particles. It can be a sign of a more serious health condition and should be evaluated by a healthcare professional.
