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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.
Some common causes of chest pain include: 1  Acid reflux. 2  Heartburn. 3  Fibromyalgia. Anxiety. 4  Ulcers. Asthma.  Heart 1  attack. Pneumonia.  High blood 1  pressure. Ribs that are bruised or  broken.