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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.
In one study, people who were eventually diagnosed with a heart attack complained of chest pain that lasted an average of two hours. Those individuals who had chest pain of less than five minutes' duration did not have a heart attack. So what does this mean to you? A heart attack is more likely to cause chest pain that lasts longer than five minutes.