Why do my fingertips turn white when I hold a cold glass of water?
1. Introduction Fingertips turning distinctively white upon contact with a cold object, such as a glass of water, is the classic clinical presentation of Raynaud’s phenomenon. This physiological response is characterized by an exaggerated vasospasm, where the small blood vessels supplying the extremities constrict sharply and inappropriately. Instead of merely slowing blood flow to conserve … Read more