In Raynaud's phenomenon, smaller arteries that supply blood to the skin constrict excessively in response to cold, limiting blood supply to the affected area.

The fingers, toes, ears, and tip of the nose are commonly involved and feel numb and cool in response to cold temperatures or stress. It's often accompanied by changes in the color of the skin.

Treatment beyond self-care, such as dressing warmer, usually isn't needed.

A condition in which some areas of the body feel numb and cool in certain circumstances.

Consult a doctor for medical advice

Sources:  Mayo Clinic and others.

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Cases per year

More than 200,000 US cases per year

Treatable by a medical professional

Usually self-diagnosable

Lab tests or imaging often required

Chronic: can last for years or be lifelong

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