Why are my hands always so cold?

My hands always gets so cold to the point they start shaking a little and i cant feel them or start to hurt a little. Right now, it's really hard to type because they're so cold. They rest of my body is fine, but my hands are always so cold. I eat fine, I exercise, and I'm healthy... So I don't really know why. Anyone have any ideas? Should I go to a doctor?