Search by keyword or browse our list of services.
Find a provider by specialty, location, or availability.
Available seven days a week from 8 a.m. to 8 p.m.
See current studies testing new drugs, devices, and equipment to find better ways to treat and help patients.
For life-threatening medical emergencies, call 911 without delay. For a mental health crisis, call or text 988 for free and confidential crisis support.
Search by specialty and location.
Receive the highest level of care from the region's leading providers.
Find a lab or imaging facility close to you.
Search for a retail pharmacy in your area.
Find an outpatient infusion center.
Visit us to pay bills, ask billing questions, or request billing records.
MyChart
The lower esophageal sphincter (LES) is a ring of muscle that forms a valve at the lower end of the esophagus where it joins the stomach.
The LES stays closed except during swallowing, when it allows food to pass from the esophagus into the stomach. When the LES is closed, it prevents the backflow (reflux) of stomach acid into the esophagus. If the LES does not close tightly enough, stomach acid backs up into the esophagus, causing heartburn. A weak lower esophageal sphincter is a major cause of gastroesophageal reflux disease (GERD).
Current as of: March 20, 2023
Author: Healthwise Staff
Clinical Review Board
All Healthwise education is reviewed by a team that includes physicians, nurses, advanced practitioners, registered dieticians, and other healthcare professionals.
This information does not replace the advice of a doctor. Healthwise, Incorporated disclaims any warranty or liability for your use of this information. Your use of this information means that you agree to the Terms of Use. Healthwise is a URAC accredited health web site content provider. Privacy Policy. How this information was developed to help you make better health decisions.
To learn more, visit Healthwise.org
© 1995- Healthwise, Incorporated. Healthwise, Healthwise for every health decision, and the Healthwise logo are trademarks of Healthwise, Incorporated.
People are at the heart of great health care. That's why we are committed to delivering compassionate, high-quality care tailored to the communities we serve.
Together with our community partners and patients, we're building a stronger, healthier future for all Idahoans.
