Stricture birth.

Some years back, when the Internet was newish, I stumbled on a chat room for Crohn's Disease. Three women were discussing, and stating, that the pain from a Crohn's stricture was much worse than child birth.

And so. Alien, the movie.

Dan O'Bannon co-wrote the film Alien. If you can remember Alien, or its sequels and prequels, you'll remember the scenes where the humans are impregnated with an alien embryo. Later they give an unwanted, murderous birth to an alien offspring. Then the cries and the tearing, as the gut wall opens up with a splatter of blood and guts. Sorry about that.

Why am I writing this? Because one of the two writers for the movie, Dan O'Bannon, suffered Crohn's Disease. He died from complications of his disease. It's well documented that he based the Alien character on the pain he suffered.