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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.
Chest pain is one of a few medical complaints that almost always needs emergency medical care, and should never be initially seen at a doctor's office. Heart attacks deprive the heart muscle of needed blood and oxygen. They are usually caused by a blood clot in an artery already clogged with cholesterol deposits.