I run often and i recently ran 5 miles and i have a really sharp pain in my shins its worse in my left leg what could it be?
Shin splints. Which is another way of saying that you used your muscles more than you are supposed to. Take a rest, don't run again before three days.http://en.wikipedia.org/wiki/Shin_splints
I am not a doctor, but it might be shin splints.
Shin splints. They hurt like heck, and I get them all the time, but they go away after a while.