What is Raynaud's phenomenon?
(say "ray-NOHZ") phenomenon is a problem with blood flow. Your body doesn't
send enough blood to your hands and feet, so they feel very cold and numb. In
most cases, this lasts for a short time when your body overreacts to cold
You may also hear this condition called Raynaud's syndrome or Raynaud's disease.
For most people, Raynaud's is more of a nuisance than a
What causes Raynaud's phenomenon?
Often Raynaud's has no known cause. (This is sometimes called primary Raynaud's.)
Raynaud's is usually a symptom of another
disease, such as
rheumatoid arthritis, or
atherosclerosis. It may also be caused by taking certain medicines, using
vibrating power tools for several years, smoking, or having frostbite. (This is sometimes called secondary Raynaud's.)
Certain things can trigger an attack of symptoms. The most common trigger is exposure to
cold. In the cold, it's normal for the body to narrow the small blood vessels
to the skin and to open the blood vessels to the inside parts of the body to
keep the body warm. But with Raynaud's, the body restricts blood
flow to the skin more than it needs to. Other triggers can include emotional stress and things that affect the flow of blood, such as smoking, caffeine, and some medicines.
What are the symptoms?
During an attack of
Raynaud's, the body limits blood flow to the hands and feet. This makes them feel cold and numb and then turn white or blue. As blood flow
returns and the fingers or toes warm up, they may turn red and begin to throb and
hurt. In rare cases, Raynaud's affects the nose or ears.
attack most often lasts only a few minutes. But in some cases it may last more
than an hour.
How is Raynaud's phenomenon diagnosed?
Raynaud's, your doctor will ask you questions about your symptoms and do a physical exam. You'll need to describe what happens during an attack.
If you can take a photo of the affected area during an attack, the photo may also be helpful to your doctor.
There are no tests that can show that you
have Raynaud's. But your doctor may do a blood test or other tests to rule out diseases that may be causing your symptoms.