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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.
Often, chest pain can occur due to sore chest muscles. Soreness in chest muscles is often due to repetitive, excessive use of muscles, or due to trauma to the chest. When strong force is applied to the chest region, beyond what the chest muscles can bear, the muscles of the chest get bruised and injured.