acid reflux
noun
: backward flow of the acidic contents of the stomach into the esophagus that is due to malfunctioning of a sphincter at the lower end of the esophagus and that results especially in heartburn : gastroesophageal reflux
a medication for acid reflux
Acid reflux is the backflow of stomach contents into the esophagus. The feeling of acid reflux is heartburn: a mild burning sensation in the mid-chest …—
The Tennessee Tribune
The Tennessee TribuneAcid reflux occurs when the valve between your esophagus and stomach doesn't close properly, allowing stomach acid to wash back up through your esophagus …—Miriam Jones Bradley
Miriam Jones BradleyExamples of acid reflux in a Sentence
Recent Examples on the Web
After an acid reflux pill couldn’t soothe the fiery feeling, her husband suggested a trip to the emergency room.
—Caleb Hellerman, CNN Money, 20 Apr. 2026
Your digestive system raises your core body temperature and keeps the gut active long after lights out, and acid reflux triggered by late meals is one of the most underappreciated reasons parents wake up in the night.
—Allison Palmer, Miami Herald, 16 Apr. 2026
More than 5% also complained of abdominal pain, acid reflux, headache and dizziness.
—Melissa Rudy, FOXNews.com, 14 Apr. 2026
Reflux, Congestion and Morning Puffiness If nighttime acid reflux is an issue, back sleeping with your head slightly elevated can help keep stomach acid from flowing into the esophagus.
—Allison Palmer, Sacbee.com, 9 Apr. 2026
See All Example Sentences for acid reflux
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Caleb Hellerman, CNN Money, 20 Apr. 2026
Your digestive system raises your core body temperature and keeps the gut active long after lights out, and acid reflux triggered by late meals is one of the most underappreciated reasons parents wake up in the night.
—Allison Palmer, Miami Herald, 16 Apr. 2026
More than 5% also complained of abdominal pain, acid reflux, headache and dizziness.
—Melissa Rudy, FOXNews.com, 14 Apr. 2026
Reflux, Congestion and Morning Puffiness If nighttime acid reflux is an issue, back sleeping with your head slightly elevated can help keep stomach acid from flowing into the esophagus.
—Allison Palmer, Sacbee.com, 9 Apr. 2026
See All Example Sentences for acid reflux
Cite this Entry
“Acid reflux.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/acid%20reflux. Accessed 24 Apr. 2026.
Copy CitationMedical Definition
acid reflux
noun
: backward flow of the acidic contents of the stomach into the esophagus that is due to malfunctioning of a sphincter at the lower end of the esophagus and that results especially in heartburn : gastroesophageal reflux
… people who report experiencing at least weekly symptoms of acid reflux have substantially higher risks of BE [=Barrett's esophagus] than those with less frequent episodes. Moreover, we found that symptoms of acid reflux experienced at older ages conferred substantially higher risks of BE than symptoms at younger ages …—Kylie J. Smith et al., Cancer Epidemiology, Biomarkers & Prevention
Kylie J. Smith et al., Cancer Epidemiology, Biomarkers & PreventionLove words? Need even more definitions?
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