Wouldn't be heart: The story fits more with what's behind the heart.When we swallow our own spit we open the entrance to the stomach.If it is processing food, the squeeze will push stomach acid up into the lower esophagus.For some this will cause transient pain.Tums (calcium carbonate) can helps some, but avoiding caffeine & not laying down for an hour after eating, can help it fade sooner.
Answered 6/22/2018
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