The other night, I was up late with the baby and idly scrolling through Pinterest. Pinterest shows me all kinds of weird, random things, and for some reason, it started showing me Whump prompts.
Whump is a splinter-genre that mostly hangs out in fanfiction. It’s the story of a character who is injured in some way, but conceals it from their friends until they collapse (the “whump” is them hitting the floor). Here are some sample prompts:

So, basically, it’s teasing out the scenes in books when a character is hurt, and then wallowing in just that scene via fanfic. Probably some fetish thing.
Anyway, as a professional author, I wanted to point out both the weakness of Whump, and how it make it stronger:
You have to earn it.
If the reader doesn’t care about this character, why should they care when they’re injured?
This works well in fanfic, because the original writers have already done all the work worldbulding, establishing the characters and their arcs, relationships, etc. Readers come to the fanfic with all that background already in their heads, and thus enjoy a story about their favorite character in peril.
But what if the fanfic writer did a little more work? What if they wrote a character arc and a story with actual stakes? That way, when the character is injured, readers have even more reason to care.
What about original stories? You have to work even harder so the worldbuilding and character arcs make sense. If you’re writing any kind of adventure story, the characters taking an injury is one example of conflict and raising the stakes. “If we don’t get medical help, he’ll be dead in eight hours!”
Readers love caring about characters. Make them care about the character first–make them funny, or annoying, or agreeable, or hateable–anything you please. And then put them through hard things to see them react and watch them grow. Readers love stakes and conflict. It’s what makes a good story. Whump is only a small, small part of it. So if you want to write something like whump, make sure you’ve done the work to earn it. You’ll have your readers screaming in anguish. And the screams of readers are a feast for the author. 😀