GERD: Understanding Your Acid Reflux
Gastroesophageal reflux disease affects roughly 20% of adults in the Western world. Understanding how it works — and why it varies so much from person to person — is the starting point for managing it effectively.
How GERD works
At its core, GERD is a failure of the lower esophageal sphincter (LES) — the muscular valve between your esophagus and stomach. When it relaxes at the wrong moment, or doesn't generate enough pressure to stay closed, stomach acid travels upward and irritates the esophageal lining. This can happen through several distinct mechanisms: brief inappropriate sphincter openings (transient LES relaxations), reduced baseline sphincter tone, delayed gastric emptying, or increased abdominal pressure from weight or meal volume.
Because those mechanisms differ between individuals, so do the triggers. The well-known "avoid these foods" list — coffee, chocolate, citrus, spicy food — is rated as conditional and low-quality evidence by the ACG 2022 guideline. Weight loss and meal timing are consistently better supported than any specific food avoidance. What this means in practice: population averages are a starting hypothesis, and identifying your personal pattern is the evidence-based approach.
Explore GERD topics
Each section goes deeper on one aspect of understanding and managing GERD.
Track your personal GERD patterns — free
GutDiaries logs your meals, symptoms, and lifestyle factors so you can find what actually affects your reflux — not what a generic list says should.
