Raynaud's Phenomenon

What Is It?

Published: November, 2018

Raynaud's phenomenon is a blood vessel disorder. The condition is also called Raynaud's disease or Raynaud's syndrome.

When healthy people are in a cold environment, the tiny blood vessels in their skin constrict, or narrow. This is an effort by the body to conserve heat.

To continue reading this article, you must log in.
  • Research health conditions
  • Check your symptoms
  • Prepare for a doctor's visit or test
  • Find the best treatments and procedures for you
  • Explore options for better nutrition and exercise
Learn more about the many benefits and features of joining Harvard Health Online »