Cold hands are a serious sign that something is wrong with your neck, which can be dangerous. Poor neck health leads to reduced blood flow to the brain, higher blood pressure, and shorter lifespan. The reason for cold hands is vessel spasms caused by tension in the neck. The neck controls blood flow to the hands, so if you want warm hands again, do a daily neck self-massage. Focus especially on the sides of the neck, where the scalene muscles, nerves, and vessels are located. This will help restore microcirculation and improve vessel tone in the hands