Understanding acid reflux is a little easier when you're familiar with the terms. Here are a few you'll find throughout our Web site.

acid reflux disease
Acid reflux occurs when the sphincter between the stomach and the esophagus relaxes when it shouldn't, allowing stomach acid to flow up into the esophagus. When acid reflux occurs frequently, it is called acid reflux disease or GERD (short for gastroesophageal reflux disease).

acid regurgitation
The feeling of a sour or bitter-tasting liquid flowing up and into the mouth.

antacids
Medication that neutralizes acid, such as the acid produced by the stomach.

erosions
Erosions caused by acid reflux disease are shallow sores that develop in the lining of the esophagus.

erosive acid reflux disease
Acid reflux disease in which stomach acid flowing into the esophagus causes erosions to develop there. Also called erosive GERD, or erosive esophagitis.

esophagus
The muscular tube that carries food from the throat down into the stomach.

heartburn
A burning feeling within the chest area under the breastbone caused by acid in the esophagus.

nighttime acid reflux disease
Acid reflux disease in which symptoms such as heartburn occur at night.

over-the-counter medicines
Medications that can be purchased without a doctor's prescription.

proton pump inhibitor
A type of medicine that shuts down many of the stomach's acid-producing pumps.

sphincter
A ring-like band of muscle that opens and closes. One example is the muscle between the esophagus and the stomach, which is called the lower esophageal sphincter (LES).

stomach acid
Liquid produced in the stomach to help break down food and kill bacteria.