Stomach acid, or stomach contents chemical that refluxes into the esophagus, causing the burning pain of gerd.
Acidic stomach secretions are combined with food in the stomach to break it down (called chyme). This often has a pH of approximately 2, which is quite low (acidic). The burning feeling is caused when this liquid occasionally refluxes back into the esophagus.
Stomach acid, especially HCl, which builds up in excess and causes heartburn, is the culprit. This acid is necessary for the digestion of the food we consume, but it may frequently back up into the esophagus and provide that familiar burning feeling. Anyone can have occasional heartburn or acid reflux. However, if you typically get it twice a week or more, you may be at risk for complications that might harm your throat.
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