I have chest pain both left and right, dull pain when taking a long breath. I feel a lot of pain when twisting or working my chest muscles. I've been in pain for a few days now, suddenly I'm in such pain. So the doctor told me the dull pain in the left chest is a sign of what disease? Is this disease dangerous?

I have a dull pain in my left chest since 1pm until now. When lying on the left side, the pain is sharp, lying down is also painful and difficult to breathe. So the doctor asked me if the dull pain in the left chest with shortness of breath is a sign of the disease? I thank you doctor.