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"Heartburn." 17 February 2005. HowStuffWorks.com. <http://health.howstuffworks.com/adam-200087.htm> 09 May 2008.
Heartburn
Heartburn is experienced as a painful burning sensation in the chest. This animation shows what happens to the digestive tract that causes heartburn, when digestive acids reach the esophagus from the stomach.
If the animation above isn't working, click here to get the Shockwave player.