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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 can be caused by anything from muscle pain to a heart attack and should never be ignored. You should call 999 for an ambulance immediately if you develop sudden severe chest pain, particularly if: the pain feels heavy, pressing or tight.