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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.
A heart attack is the common cause of chest pain, but you may experience pain in your chest due to many other conditions as well. You should know about what side is your heart on to be able to understand that you're having a heart problem that needs immediate attention.