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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 can have many causes, including: 1  costochondritis (pain or swelling between a rib and the breast bone) 2  muscle strain or injury. 3  exercise-induced asthma.  acute 1  bronchitis. pain from coughing.  pain from repeated 1  vomiting. gastroesophageal reflux (acid reflux).