ROOM TO GROW TMZSports.com
Fight camp was anything but smooth for Kayla Harrison ... the UFC star tells us she was hospitalized and "peeing blood" the week before UFC 307!
The 34-year-old bantamweight joined Babcock on the TMZ Sports TV show (airs nightly on FS1) on Monday ... where she revealed the lead-up to the Ketlen Viera scrap didn't exactly go as planned.
"I'm still learning. I'm still growing. I feel like there's a lot of room for improvement for me.