If I say it in words there's no guarantee you'll believe me. But, as an example..

[ Yuri takes her hand up to her mouth and bites the side of her index finger hard enough to make it bleed. There's no way it wouldn't hurt, but it doesn't seem to bother her too much besides some tiny hints of wincing. High pain tolerance. ]

Give it a few minutes and something this small will heal right up. You could get chopped into a million pieces and it'd work just the same, though it'd take a little more time.