Acid reflux is a condition where gastric juices containing acid travel back from the stomach into the esophagus (gullet or swallowing tube). Symptoms of acid reflux include:
Heartburn (a burning feeling rising from the stomach or lower chest up towards the neck).
Regurgitation (bringing food back up into the mouth).
Acidity is generally caused by an imbalance between mechanisms of the secretion of acid in the stomach, and protective mechanisms that ensure the stomach’s safety. The stomach secretes acidic fluid that helps in digestion process.