Heartburn (GERD)   Definition, causes,   symptoms, complications, and treatment. In this article we will cover thee following topics regarding HEARTBURN Definition . Causes . Symptoms . Complications . Treatment . References. Heartburn (GERD)   definition: Heartburn ( also known as GERD   or Acid reflux) is a burning sensation in your chest   behind   your sternum   (breast bone),Sometimes the patient feels the pain is rising upwards. This pain increases by: Eating. Lying down. At Night. Heartburn prevalence : Heartburn or GERD is a very common symptom worldwide. Official Statistics in Nov.2020   reveals that almost 20 % of the adult population in the united states suffers from heartburn. But actually, the prevalence is much higher because a lot of patients seek OVER THE COUNTER   heartburn medications before any medical consultation. Heartburn causes : Heartburn (GERD) happens when the stomach leaks its contents ( acid and/or food...