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Why are my feet always cold and numb?

I'm a 21 year old full-time college student. I exercise 3 times a week, and have a relatively healthy diet. My family has no history of diabetes but I recently got tested for it anyway. The test was negative. I will sometimes be wearing two pairs of socks and my feet will still be so cold they become numb. It seems the only way I can get them warm is by putting them by a space heater, and even then it takes 10-15 minutes. What is going on?
There are many different things that can cause a person's hands and feet to feel cold, even when indoors or when it would be unusual for this to happen. As you mention, diabetes is something that can lead to a loss of sensation in the extremities. A condition called peripheral artery disease (PAD) can do the same thing. However, it takes years of uncontrolled diabetes to cause neuropathy symptoms, and PAD is likewise typically a disease of older patients with uncontrolled cholesterol and cardiac risk factors. In a younger patient, cold extremities are more unusual and so it is best to make an appointment with your primary care doctor so he or she can go over your entire history and perform a physical exam to try and identify what might be happening. Several possibilities come to mind based on the symptoms you describe. First, thyroid problems can cause people to be either too hot or too cold. Too much or too little thyroid hormone typically also causes several other symptoms, so your doctor will probably ask you about any changes in your weight, skin, and hair, as well as symptoms like fatigue, menstrual changes, or palpitations. Second, problems with the blood vessels in your feet may also cause the symptoms you describe. In some people, the smaller blood vessels in the extremities will sometimes spasm and limit blood flow. This can cause the feet or hands to become very cold or even discolored. The best way to identify what might be happening with your cold/numb feet is to see your PCP who can then direct you to any appropriate specialists.
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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