When the lower esophageal sphincter doesn't close properly, stomach acid flows into the esophagus, causing acid reflux, or heartburn.

Learn more about the anatomy, physiology, and pathology of the digestive system with Visible Body Web Suite: https://www.visiblebody.com/websuite

Additional sources:
https://www.gastroconsa.com/7-bad-eat...
https://thesurgicalclinics.com/foods-...
https://www.nhs.uk/conditions/heartbu...
https://www.nhs.uk/conditions/nsaids/
https://medlineplus.gov/gerd.html
https://www.cedars-sinai.org/blog/wha...
https://www.everydayhealth.com/digest...
https://www.niddk.nih.gov/health-info....