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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, medically termed angina, occurs when there is a lack of oxygen in the blood flowing to the heart muscle. Angina may be experienced as a tense feeling in the chest, a sensation similar to heartburn, or aching or pain of the chest, shoulder, arm, neck and surrounding areas, and may be accompanied by nausea, increased sweating and cramping.