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| | MedlinePlus Medical Encyclopedia: Swallowing difficulty |
 | | Is the difficulty constant or does it come and go? |
 | | Esophageal acidity test, also called a pH probe (checks for acid that comes from the stomach and enters the esophagus, as in gastroesophageal reflux disease) |
 | | Updated by: Jenifer K. Lehrer, MD, Department of Gastroenterology, Frankford-Torresdale Hospital, Jefferson Health System, Philadelphia, PA. Review provided by VeriMed Healthcare Network. |
| www.nlm.nih.gov /medlineplus/ency/article/003115.htm (564 words) |
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