Why does it hurt under my foot when I walk?

I've got an appointment with my doctor next week but wondering if anyone knows what it could be.

When I put my left foot on the ground to walk, it is painful under the ball of my foot when I walk. Sometimes my toes feel like pins and needles also.

When I touch underneath the ball of my foot it hurts there too.

I've never had this pain before and noticed it a few weeks ago.

I stand for about 4 hours a day at my job, then the other 4 hours I'm sitting down.

It just always hurts underneath my left foot when I walk.

Why does it hurt under my foot when I walk?
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