My wife just started having raynauds phenomena and her hands turn a blue pigment. what might cause this suddenly? she has no history? is it dangerous

See details: Have the issue evaluated by a rheumatologist. Raynauds may be the presenting feature for a connective tissue disorder. Raynauds is an autoimmune disorder and is often very treatable and usually not dangerous.

Needs eval: There are dozens of diseases which can cause raynaud's phenomenon, including lupus and other connective tissue and vasospastic diseases. Rheumatologic evaluation should be helpful.