Do you often experience a sour mouth accompanied by pain in the chest to the throat? It could be that it is a symptom of GERD. Recognize what are the symptoms of GERD and the steps to deal with it. GERD (gastroesophageal reflux disease) or stomach acid disease is caused by a weakening of the valve or sphincter located in the lower esophagus. Normally, this valve will open to allow food and drinks to enter the stomach and be digested. After food or drinks enter the stomach, this valve will be closed tightly to prevent the contents of the stomach back up into the esophagus. But in patients with GERD, this valve is weakened, so it cannot close properly. This causes the contents of the stomach which contains food and stomach acid to rise into the esophagus. If this condition occurs continuously, the lining of the esophagus will become irritated until inflammation and eventually become weak. Common GERD Symptoms Occur The usual symptoms when stomach acid rises are sour or bitter tas...