Seriously. This happens occasionally since I was small. Say, once every 2/3 years. I think it's one of those things that happens to everyone at least a few times in their life.
It hurts like hell. Like giving birth but I never knew that when I was a kid. I had it happen to me today and it was excruciating pain for about 3 mins I had to breathe like I was having contractions. It's the first time it's happened in about 4 years.
What's the scientific reason for it?
(I'm not a poo troll or anything, just want to know if it's one of those human bodily functions that are strange and happen to everyone).