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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 a strained or pulled muscle, a pinched nerve or an inflamed tendon. An injured rib can also cause pain that is difficult to localize. Shingles is a viral infection that may begin as a burning sensation on the chest, torso or back before lesions appear.