>>19930776>>19930829Ulcerative Colitis. She talks about it in her vtuber lore video.
https://www.youtube.com/watch?v=PKetANoiIS4 And if you want to hear more I'm glad for the pastebin because it's noted here. Layna and Mouse talked pretty extensively about both of their medical histories during the subathon. It's a pretty fucked up conversation but it's an interesting one if you want to see one of the few people who's had similar experiences to Mouse.