Raynaud’s can occur on its own (primary Raynaud’s) or as a result of an underlying condition (secondary Raynaud’s). The exact cause of primary Raynaud’s is not fully understood, but it is thought to be linked to an exaggerated response of the blood vessels to cold or stress. Secondary Raynaud’s is often associated with conditions such as autoimmune diseases (e.g. lupus or scleroderma), vascular disorders, or occupational factors like prolonged use of vibrating tools.