Hey Nick, thanks for the fast reply

I'm currently 18 but it started last year when i was 17 - i'm pretty sure i've stopped growing... The pain completely subsides if i stop using it for around a day but returns if i overuse (play hacky) it again. Also worth noting is a similar, but not exact pain has started to form in my left inner upper thigh from snowboarding - any movement that involves lifting my leg (popping over jumps etc..) sends a short shooting pain followed by a throb. Again around after a day or two of rest it returns to normal. It seems only harsh strain causes both legs to play up again. There is no visible sign of injury - no swelling, redness etc. So i guess something must be being overstretched

cheers,
Bryn