Yes it is true!
Yeah he did but he came out a few months ago (like 5 I think...?) He came back recently with a cover of A-un Beats!! His voice is definitely changed from before but I'm really happy he's back!
What happened (I read this a while ago when he announced it back in January (or maybe longer I don't remember) so I might not have all the exact details. I think it might be in his LINE blog) was that before he use to cover a LOT right? And he did a lot of live concerts too. Over the years it lead to a callous-like thing in his throat (the exact name of the disease I don't remember). It's caused by straining your throat so like singing or talking a lot in an unnatural way (unnaturally higher or lower or to imitate someone) or just from singing/talking too much (with little rest, which is probably Kashitaro's reason) It's kind of like a tumor but I don't think it's a type of cancer (so it confuses me a little) so he had to get it out (I think judging because it's tumor-like).
He's doing better now but if you listen to his podcast thing/read his blogs (basically read everything on twitter) you can get more info about it! Also I think some translators have translated his blogs or tweets so if you search for info on his operation you'll probably find something! Sorry this was kind of long....-_-;
Daaang @SalmonPapico thanks for the indepth coverage! I had no idea!! Glad to hear that everythung turned out well though :O
he just uploaded sumthin yesterday;he was though active as itowokashi i didnt know
What do you think?