J. Clark
I have a friend that was just diagnosed with walking pnuemonia, too. He described everything just as you did...the rib pain, no fever, little cough...but before the rib pain, he was coughing up blood. He had a chest x-ray which revealed that he has lost 10% of his lung tissue. The doctor could not tell him the reason he got it, but did say that it could reoccur over and over. Hope you feel better soon.