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You wouldn't think it but there are a few tendons in your sternum. Sometimes I can make mine pop and crunch... Anyway, you might have tweaked a tendon due to lack of flexibility and now you keep irritating the injury. I'd say lay off any chest exercises for a couple of weeks then work on your flexibility in that area - just hanging as deep as possible in the dip bars might help, or extend your arm out against a wall and twist away from it to stretch out your pec.
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