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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 from pericarditis is usually a sharp pain coming from the left side of the chest underneath the breastbone. The pain might radiate into the left arm or into the neck. Chest pain occurs because the pericardium is pressing up against the outer part of the heart.