Either from overuse/over training problems or from out of the blue stuff.
I was walking down into the basement a couple days ago when all of a sudden I found myself sliding-bouncing down the stairs and coming to a stop at the bottom. DK (dear kitty) came down to see what the noise was and why I wasn't filling his food bowl. I hobbled back upstairs, fed the cat-mustn't keep kitty waiting, took some aleve and a muscle relaxer and hoped for the best.
Today's the 3rd day and I'm in absolute pain. I've got a muscle spasm that is pushing up against my sciatica nerve. I'm taking prescription strength anti-inflamitories, a muscle relaxer and tylenol. Doctor said it was ok to add the tylenol because it's not an NSAID. When it's working together at just the right concentration I'm blessedly free of pain, but in the morning it takes awhile for it all to get into sequense and work at the same time. Ouch, pain I've had it happen before so I know the signs. It heels eventually with rest, gentle stretching, doing a little but not too much and knowing the difference.
So I have to give up running for a few weeks so I guess I should keep better tract of my eating because if I'm not careful I'll use this as an opportunity to eat to make myself feel better. Don't you just know that strawberry cheesecake and whipped cream is a cure for all problems?
No? Maybe that's why I got so big in the first place-eating to fix everything?
I just need to know that other people slide down the stairs and I'm not the only clutz. I do it a couple times a year. Make me feel better people! Please.
Sarah

I hate being hurt and in pain!!
You will be back out running soon!!! 
and some
. Feel better soon.
From one clutz to another, take it easy, take your medication and ease up on yourself! You will get back to your exercise routine soon enough.
Sidewalk Gremlins OMG!
I forgot about those! Yes, I have a few too. ANd it's usually nothing that I trip over.
Thank you, thank you, thank you! I don't feel so bad now. I always turn around and look at the sidewalk and make it seem like I actually tripped on something and not my own feet.