I just discovered (the hard way) the very painful possible side-effect of ginger. :oops:
My doctor just said I have gallstones, and a gallstone probably got stuck in the tube leading from the gall bladder, which is why I had terrible abdominal pains for three weeks. (The pain is gone now, but I still have gall-stones).
Ginger is considered very suspect because it increases bile production. It's not unanimous that ginger is bad for gallstones, there is a minority that says it might be good for them, but it is definitely interferes with normal gallbladder operation in some way.
Remember, just because a drug is "natural", doesn't mean it doesn't have serious side effects, and doesn't mean it's not still a drug. Things that have an effect, usually have side-effects too.
BTW, my doctor had heard of the Oculus Rift and its kickstarter development kit. He keeps asking me about it.