"i support & love u brother, I see in you bravery & courage to stop this tour & take care of YOU. You are a GREAT artist," she offered in one post.
"While I don't agree with everything he does I hope the public shows compassion and for @kanyewest and each other. One love. One Race," read another message.
"It's not funny to joke about anyone's possible or not possible mental illness, this is a sensitive time for many. Let's be kind & loving," she also said.
West -- who is married to reality TV star Kim Kardashian -- has been hospitalized since Monday for "exhaustion." He last week canceled his Saint Pablo concert tour following days of attention-grabbing rants on stage.
. @kanyewest i support & love u brother, I see in you bravery & courage to stop this tour & take care of YOU. You are a GREAT artist 🎨💋— xoxo, Joanne (@ladygaga) November 23, 2016