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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 is caused by a variety of mild to serious disorders, diseases or conditions. Chest pain can result from infection, infarction, inflammation, trauma, malignancy, and other abnormal processes. While many cases of chest pain are due to problems with the heart, chest pain can also be due to respiratory diseases, problems with digestion, anxiety disorders, or a pulled muscle or tendon.