Our expert says:
I suspect it's probably a strain or a sprain of some sort, perhaps one of the intercostal muscles. It's unlikely to be a straightforward problem of using muscles you haven't used yet, becaus your pain came on very suddenly, as opposed to the delayed, gradual pain of muscle stiffness. So I think that you need to rest for a little while, maybe 3 or 4 days and then see what it feels like, before you resume normal training. The tricky thing about this area is that you can't really speed up the recovery like you would be able to do with a muscle in your leg say (assuming it's muscular), so you kind of just have to ride it out. If it doesn't improve, then it's probably wise that you see a doctor next week, after giving i some time to heal by itself.
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