I had this same thing turns out it was ....
Course you want to see a doctor anyway, especially if its a prolonged issue.
Costochondritis
This is a common but poorly understood condition in which the cartilaginous sections of the ribs attaching to the sternum become inflamed. It presents as chest pain and may mimic cardiac pain. There is tenderness over the costochondral or chondrosternal joints. Other than causing a great deal of anxiety, this is a benign condition and reassurance and analgesia often work. Corticosteroid injection may speed recovery and allow an earlier return to competitive activity.
The tears came from taking hockey slap shots, the downward force and contortion of the body is what did this. If your hitting a medicine ball hard for abs in a crunch format you may have torn the same thing. It heals and then re-tears when you do some serious contortion. It's irratating like heartburn but nothing serious.
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