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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.
Sometimes, chest pain may result from injury to the chest area from a fall or accident. For example, pain from a rib fracture may worsen with deep breathing or coughing. It is often confined to one area and may feel sore when you press on it. The area where the ribs join the breastbone may also become inflamed.