ClinIQ Lexicon · Abbreviation
LES — Lower Esophageal Sphincter
What LES means
The LES is the specialized segment of circular smooth muscle at the gastroesophageal junction that maintains tonic contraction at rest and relaxes with swallowing. Its resting tone forms the principal anti-reflux barrier against gastric contents entering the esophagus.
LES in clinical practice
Things that relax LES tone — fatty meals, caffeine, alcohol, nicotine, certain medications, and pregnancy — appear constantly as risk factors in GERD question stems. The ClinIQ GERD article explains how LES dysfunction translates into reflux physiology and therapy targets.
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