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So back to your question: 1  Your chest hurts when you're emotionally sad because your brain processes physical and social pain in the same brain regions (dACC and AI) (the affective aspects of the pain). The fact that both pains overlap means the factors that decrease physical pain also decrease emotional pain.
Probably, but there's a chance the chest pain is caused by reduced blood flow to your heart (angina) or an actual heart attack. Heartburn, angina and heart attack may feel very much alike. Even experienced doctors can't always tell the difference from your medical history and a physical exam.