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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.
Muscle Pain. Chest pain may occur when the muscles of the chest become inflamed and cause pain due to muscle spasm and inflammation of surrounding tissues. Irritated muscle bands can result in muscle ache, spasm, or tightness. This can lead to pain over a remote area, know as referred pain.