Why would celiacs disease cause raynaud's phenomenon?

Auto-immune: The direct evidence for causal relationship between celiac disease and Raynaud is lacking or we don't know. Celiac disease is an autoimmune disease. Secondary Raynauds is also an autoimmune condition. A person with Raynaud’s is thus more likely to have celiac disease than that in the general population by a poorly defined immune mechanism.

Uncertain, but: It is known that celiac dz is associated w autoimmune diseases (antibodies against one's own tissues, eg diabetes-I).A letter in the Scandinavian Journal of Rheum in 2010 reported evidence of scleroderma-like activity in celiac disease. Raynaud's is found in cases of scleroderma, an auto-immune disease that causes scarring that can impede blood flow to fingers. 2010, Vol. 39, No. 5 , Pages 438-43