Yeah its pretty hard to predict how its going to go. I've had it at least twice before and the last time I'm not even positive how I got it. Possibly from stepping wrong on a curb on the street. The time before that was definitely overuse from running(2010). And this past time was excessive walking. Nothing really helped the other times. Just have to wait until it runs its course. Which I hope is less than 2.5 years!