Stomach pain dead lifting

[WaWa Bird]

Dear Mark

The past two times I wore a belt while deadlifting I got a really sharp stomach pain right below the belt, this only occurs on the deadlift. When I don't where a belt I don't get any stomach pain, but as the weight increases I have to fight off back rounding. Also of note it's a Nike belt which was a Christmas present. Is this a case of bad placement, bad product, or does this just happen to some people on the deadlift with a belt?.

[Mark Rippetoe]

If it happened a lot, you'd know, because everybody would bitch. Maybe you're wearing it too tight.