Hernia ?: It could be the hernia if it is a large one and slides into the chest specially when laying down or eating a large meal. Hard to tell without seeing the studies done. Mention this to your doctor.
Answered 1/24/2021
5.2k views
From the acid: The acid in your stomach is leaking up into your esophagus when you lay flat. This causes pain in your chest. It's not from your heart.
Answered 9/28/2016
5.1k views
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