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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.
There are many other potential causes of chest pain, including: 1  shingles â a viral infection of a nerve and the area of skin around it, which causes a painful rash that develops into itchy blisters. 2  mastitis â pain and swelling of the breast, which is usually caused by an infection, most commonly during breastfeeding.