Acid reflux also known as pyrosis and acid indigestion is a burning sensation around the chest which caused by the flow of stomach acid back into the food pipe. The burning occurs when the gastro esophageal sphincter which acts as a valve to prevent the back movement of food from stomach to the food pipe fails; this enables the entry of the stomach hydrochloric acid.
This disease is common in all age groups and often associated with certain food, drinks and lifestyle. Sometimes it is caused by hiatal, a condition in which a hole in the diaphagram enables the upper part of the stomach to enter the chest cavity.
Sixty percent of the adult population will experience some type of gastroesophageal reflux disease (GERD) within a 12 month period and 20 to 30 percent will have weekly symptoms. Approximately seven million people in the United States have some symptoms of GERD.