My hands are numb when it's cold. What happened to whitening?

Hello! According to your symptoms, cold weather will make your fingers white and numb, which should be caused by high blood vessel tension and vasospasm.

This condition may be a common Raynaud's syndrome, which can be treated with some vasodilators such as dibazole. You can also consult Chinese medicine to see how to use some warming drugs to improve it, and eat more food supplemented by onions, ginger and garlic at the same temperature.