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Why do my middle fingers turn white and go numb when I get cold?

I am a 25 year old female dog trainer. I frequently participate in outdoor activities during all months of the year. Last year I lost 100 lbs. During the last few months I have noticed that during some outdoor events, my middle fingers on both of my hands will go completely white and then totally numb. Once this happens, it takes several hours in a warm location for the feeling and color to come back. If I have any available, a hand warmer wrapped around my middle fingers will make the feeling come back faster.
Your symptoms are somewhat concerning. I would recommend that you discuss this with your primary care doctor. This should be evaluated. In general, when exposed to cold, the body works to defend its normal temperature (98.6 degrees F). Therefore, the blood vessels in the skin constrict down so less blood is exposed to the cold air and less of your body's heat can diffuse out. This is to say, your fingers becoming a little white (as the blood flow to the skin diminishes) is somewhat normal. There is a possible concerning cause of this known as Raynaud's phenomenon. Raynaud's is a pathological constriction of the blood vessels in response to cold. This normally involves all of the the fingers and often the toes. The phenomenon by itself is not a major condition, but unfortunately it is sometimes associated with other diseases. Therefore talking to your primary doctor to rule out these other disease is important (if it truly sounds like Raynaud's). There are autoimmune diseases (like lupus), cancers and other endocrine disorders that should be ruled out. The other possibility is a narrowing of the blood vessel feeding the finger. If you are a smoker this can be known as Beurger's disease. I recommend that you see your doctor as soon as possible.
This answer is for general informational purposes only and is not a substitute for professional medical advice.
If you think you may have a medical emergency, call your doctor or (in the United States) 911 immediately. Always seek the advice of your doctor before starting or changing treatment. Medical professionals who provide responses to health-related questions are intended third party beneficiaries with certain rights under ZocDoc’s Terms of Service.

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