Would it work on scurvy, or would you have to resort to a Create Food spell and feed the victim up?
How about a congenital disease? A chronic condition?
I think that those would require heavier duty Cure Disease spells, except the scurvy, which would indeed require Create Food -- or just plain food. May even require Create -- err -- Required Food, which is a heavier duty version.
Decisions, decisions. And all because I decided to give one character a congenital disease that led to people making a mistake about him, and his current life. It probably even did him good.