So in summary, then:
• Buerger's disease is arterial obstruction
of very small and medium-sized blood vessels,
usually in the hands and feet. It can lead
to gangrene, or death of tissue, at the tips
of the fingers and the toes. And it's probably
an autoimmune disease but… that's triggered
by tobacco products.
• Raynaud's phenomenon, on the other hand:
There's spontaneous spasm in the blood vessels.
This causes white discoloration of the fingers,
which eventually, fingers turn blue from low
levels of oxygen in the blood. And then eventually,
when the hand warms, the skin returns to bright
red. The classification is either primary
Raynaud's—in other words, actually Raynaud's
disease—or it's secondary either to an autoimmune
disease or to the fact that the person is
just very sensitive to cold.
• And the treatment is, of course, no smoking,
vasodilators, and avoidance or protection