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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 disorders of the digestive system, including: 1  Heartburn. This painful, burning sensation behind your breastbone occurs when stomach acid washes up from your stomach into the esophagus â the tube that connects your throat to your stomach.  Swallowing disorders.