Mountain Biking pain in the ball of my foot?

[Alex]

when I am climing on my mountain bike my toes go numb and I get a sharp pain in the ball of my foot, I have loosen my shoes, moved my clips forward and back. Any other suggestion, it hurts most during long sustained climbs. It's my right foot if thats any help
Thanks

 

[JohnM]

I had the same problem. My shoes were too tight and the clips were too far forward. The ball of your foot should be over the center of the pedal and your feet tend to swell as you ride.