-itis means the part of the body is swollen, while -osis means the part of the body is damaged.
I found this out back in 2012, when I had a very nasty case of tendonitis in one of my feet, and I found out that the vast majority of cases of tendonitis should be called tendinosis instead, as it's pretty rare for the tendons themselves to swell; rather, the tendons themselves deteriorate from overuse.
-itis means the part of the body is swollen, while -osis means the part of the body is damaged.
I found this out back in 2012, when I had a very nasty case of tendonitis in one of my feet, and I found out that the vast majority of cases of tendonitis should be called tendinosis instead, as it's pretty rare for the tendons themselves to swell; rather, the tendons themselves deteriorate from overuse.