His condition deteriorated and they decided he's to be hospitalized.
While I was hospitalized, I was so bored that I couldn't stop yawning.
I'm going to be hospitalized due to breast cancer soon.
If you end up in a situation where you have to enter an institution it's called hospitalization. Hopefully you aren't there for very long.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.