I found out last week that I have a stress fracture in my left foot... insert frowning and unhappy face here!!
The fortunate part is that it is not a "bad" fracture and I will hopefully be back up and running in three or four weeks.
Everyone knows the unfortunate part... I'm not running for three or four weeks and need to be careful coming back.
The hard part... I'm not sure what caused the fracture. I haven't been doing any significant running since April / early May, and I don't recall doing anything recently that caused trauma to my foot. So, it worries me.