Good question: Your question is a bit confusing. If you me what causes the les not to relax, this would be a neuromuscular disease called achalasia or perhaps chagas disease. If you are asking what makes the les relax too much, leading to gerd, that would be spicy foods, caffeine, nicotine, chocolate, peppermint, alcohol, some medications, tomatoes and their sauces as well as others.
Answered 1/13/2019
6.3k views
Spasm: Involuntary contraction of the circular (ring) muscle of the esophageal sphincter.
Answered 1/15/2021
4.3k views
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