What causes one to experience poor circulation in the hands and feet?

Raynaud's . Can do this, a vasospasm of the blood vessels, clogged arteries, cholesterol deposits....Can all cause poor circulation.
Hardening arteries. Smoking, high blood pressure, high cholesterol and high blood sugars are all reasons why people develop hardening of the arteries.

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What causes one to get light headed and experience poor circulation in the hands and feet?

Could be many things. There can be many causes, such as low blood pressure or variations in the blood pressure when one changes position from sitting to standing (orthostatic hypotension), or low pulse rate (bradycardia). If symptoms are bothersome enough and don't resolve with simple maneuvers such as hydration and standing up slowly, i would recommend a physical exam ad blood pressure/ pulse check by our doctor. Read more...