Our expert says:
It's impossible to say what the cause is, especially since you didn't do anything obvious to cause it - could it be that you exercised that day and the pain only came on during the night? That's the only thing I can think of - I think you need to get a diagnosis though. I can't guess at a diagnosis, given that I don't know whether it's a bone, muscle, tendon injury. So you need to see a doc about it and have them accurately diagnose, so that you can do what is required to treat it.
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