Glaucoma and as a palliative for nausea and loss of appetite while undergoing Chemo.
There are a number of other things it is claimed for but those are the only two reason I know that are truly accepted as medical treatments.
I am quite aware of the many claims regarding the use of marijuana. However, I can find very little corroboration of those claims within the medical literature. It is not for lack of trying; I’ve searched as creatively as I know how.