Bad pain underneath shouder blade + coughed up blood?

I've had those pains from over doing it physically and the blood could be from that cough of yours. If you're getting a sharp stabbing pain while breathing though I would certainly consider seeing a specialist.I'm no doctor but I knew someone who died of lung cancer who told us about that symptom.It could still just be muscle pain so see if it goes away first.By the way, I stopped smoking 5 years ago, good luck!