Referred pain from esophagus/gut https://whatcompt.com/referred-shoulder-pain-4-places-it-could-be-coming-from/
Basically the nerves in the esophagus/stomach region are saying that something in there hurts and it gets crisscrossed so that brain thinks your shoulder is hurting. Kind of like how when you have a heart attack you can have pain in your jaw. Don’t ask me why and how it gets crisscrossed; I skimmed Wikipedia and there seem to be at least 3 theories so I’m going to settle for saying “I don’t know how it works either.”
Solution is to chew your food and take smaller sips of water.
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