I have a sharp pain in my upper right back under my shoulder blade when I take a deep breath, yawn, sneeze, or perform certain physical movements. The pain can also sometimes be felt under my right ribs. It depends upon my posture. I believe I had this once before but remember the pain going away in just a few days. It's now day nine of this. I have seen a doctor. She ordered a lung x-ray, normal and blood tests to test for a clot, normal. I'm telling myself that this is muscular, as the pain is related to movements, whether heavy breathing or physical changes in posture. Am I making the correct assumption? The pain responds moderately well to Ibuprofen.