Board Thread:Theories and Speculation/@comment-27821571-20180725213000/@comment-4974066-20180725231332

If I can recall, based on discussions in the past, I think a lot of people, including myself, think Medical Ninjutsu is Yang Release, but it has never been specifically stated to be so the wiki doesn't state it. There were parallels made between Yin and Yang, Nara and Akimichi hiden, and genjutsu and Medical jutsu. The connection being if the former 3 in that list are in the same category (Yin/Nara/Genjutsu) then the later 3 must also be the same (Yang/Akimichi/Medical) which turned out to be true for Yin Release and in part for Yang Release. Also, the fact that all or most all (I think) Medical jutsu users all have Yang release leads people to believe it is. But as I said, unless the series explicitly states Medical = Yang, we can't reach any conclusions.