"Primary Raynaud's" is not a disease or even a disorder; it's a trait.
Hadler
N M
NM
D005385:Fingers / Q000503:physiopathology; D006801:Humans; D011928:Raynaud Disease / Q000473:pathology / Q000503:physiopathology; D013035:Spasm; D009626:Terminology as Topic; D014661:Vasoconstriction