My hands are always cold. Even when I have a sweatshirt on. I am a male in my late 30's and have been feeling this way for a few years now.?

Color changes. What changes do you see? Do they turn white in the cold? This suggests raynauds. Are they more uncomfortable in the cold? In the heat? With certain activities? Is the circulation good. Are eh feet also cold? Does this occur in your relative? Dr hines suggested thyroid. You need a good evaluation. Finally this may just be normality for you and not an indicator of an underlying process.
May be normal. It may be normal for you. However, thyroid deficiency can make a person susceptible to cold. Your doctor may order TSH blood test to assess thyroid function.