Well, my curious friend, i HAVE costochondritis. It is a real annoyance, because i also have panic disorder, but that's not what you want to know.
Costochondritis is where the cartilage that connects your ribs to your sternum becomes inflamed, which leads to a very sensitive sternum and very sensitive ribs. It often hurts to do something as simple as lean forward onto something with your elbows. It is a real hell bringer, because it can be confused with various other disorders of the chest area. But rest assured, in case you were wondering, if you have chest pains, and you press on your sternum, and the pain gets worse, it probably is nothing more than costochondritis, which is not serious, but is a real *****.
I don't know about the hard part under your sternum, but i can tell you, it does cause pain in the sternum.
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