This is a cut and paste I found using google. I was always curious about how ginger actually worked it's magic. So, here it is (at least according to the website I took this from)
How Ginger Works
Ginger stimulates digestion and keeps the intestinal muscles toned to ease the digestive process (with less irritation). It is helpful in combatting nausea and vomiting, because it boosts the digestive fluids and neutralizes acids. Ginger makes blood platelets less sticky and therefore less likely to clump, or clot. It also works as an antiinflammatory and pain reliever to assist with muscle aches, chronic pain, arthritis and to ease bronchial constriction due to allergies and colds.
from www.nutriherb.net/ginger.html
I use it when needed. However what ti does not say is how well it works or if you get numb to Ginger after a while.