Over the past week or soI have had a sore muscle in my chest, which I figured was just strained from coughing my lungs up. It started getting worse, particularly when I was in bed - sitting up was agony. Yesterday morning Dan checked out my rib and realised that it was out, so we thought it was just a rib that had popped out. After getting more and more painful and finally seeing a doctor, it turns out that I damaged the cartilage around the and have to take it easy for the next 3-6 weeks.
My half marathon is in 6 weeks.