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There are two types of Raynaud's:

1) Primary Raynaud's — this is the most common form and the cause is usually unknown.

2) Secondary Raynaud's — this is less common than primary Raynaud's, but this can be related to an underlying condition. Usually autoimmune connective disease disease (e.g. lupus, scleroderma, rheumatoid arthritis, and others).

Taking certain medications can also trigger Raynaud's. Culprits include beta blockers, some migraine medications, attention-deficit/hyperactivity disorder medications, some chemotherapy agents, estrogen, birth control, and over-the-counter cold medications that constrict blood vessels.

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