Raynaud's phenomenon is a condition in which some areas of the body, usually the fingers or toes, have an exaggerated response to cold temperature or emotional stress. During an attack of Raynaud's, the blood vessels in the affected areas tighten, severely limiting the flow of blood to the skin.
Normally the body narrows (constricts) these blood vessels when the skin gets cold. This helps conserve body heat. Stress or exposure to cold temperatures may trigger an exaggeration of this normal body function. The fingers and hands (or, more rarely, the feet, nose, or ears) may turn pale, white, and later blue and feel cold to the touch. Sometimes fingers or toes feel numb and tingly, as if they have "fallen asleep," or they may become painful and swollen.
© 2016-2020 Healthwise, Incorporated.