Raynaud's phenomenon in a healthy Turkish population.

Raynaud's phenomenon (RP) is a vasospastic disease and is characterized by ischemia of the digits, nose, and ears. The vasospasm can be triggered by cold weather, cold water, or emotional stress and is followed by triphasic color changes. First white color (ischemia), then blue color (congestion and cyanosis), and finally red color change (reactive hyperemia) can be observed.