Gastroesophageal reflux disease (GERD) occurs when gastric juices come into contact with the oesophageal wall (the segment of the food canal before the stomach), causing a burning feeling against the sternum and acid reflux. The passage of acid from the stomach to the oesophagus happens physiologically during the day, particularly after eating. However, if this happens more than it should in terms of frequency and duration, this becomes a pathology. If it happens occasionally, it can usually be managed with adequate lifestyle changes and treated with over-the-counter drugs. But, when it becomes a daily issue, it can affect the quality of life. In 30-35% of cases, the disease is complicated by erosions affecting the oesophagus (oesophagitis), ulcers or constrictions (3-5%), while in most cases it does not cause any harm.