Thank you for your question.
In order to better answer your question, can you tell me what other medical problems you have? Have you had any prior surgeries? Do you take any other medications? Do you have any drug allergies? Do you smoke or drink? Have you had a chest x-ray? Does it hurt when you take a deep breath?
Thanks for that additional informationCustomer
I need just a bit more clarification. Do the ribs feel particularly painful on the left side of the breastbone? When you get this pain from the ribs to the armpit, does it always or ever refer down your arm?
Based on the symptoms that you have told me, I believe that you may have a torn rotator cuff. The only way to know this for certain is to be examined by a physician, a physician's assistant, or a nurse pratitioner. Pain in between the neck and the shoulder blade could represent a tear of the supraspinatus muscle of the rotator cuff. It would make sense that this would start hurting after activity because the rotator cuff does move the arm when you walk so that you maintain a stable gait. This type of problem won't show up on an x-ray or an EKG. Tears are diagnosed by examination and confirmed by MRI. I have included a link to some information about rotator cuff tears. This link contains an article with another link with some exercises that may help.