Stubbing your toe hurts so much because you're slamming a tiny surface with a force equal to 2-3 times your bodyweight. Then a bundle of nerve endings called nociceptors fire a danger signal to your brain. Although it's not pleasant, this pain might have helped your ancestors step carefully and avoid injury and infection. Visit Business Insider's homepage for more stories. Following is a transcript of the video.Narrator: Stubbing your toe hurts.