Why Do My Fingertips Go Blue When I Open the Freezer Door?
1. Introduction Fingertips turning blue upon brief exposure to cold air is a classic sign of an exaggerated vascular response known as peripheral vasoconstriction. In individuals with heightened sensitivity, such as those with Raynaud phenomenon, the small arteries supplying blood to the skin spasm and temporarily restrict blood flow. This sudden lack of oxygenated blood … Read more
