My Mom had them---I just figured it was another way I was turning into her.
I had heard black currants were good too.

It is discouraging to have someone tell me I look tired because of them when I feel perfectly fine.

Unfortunately it's one of those things that just about everything can cause.

I have them all spring and fall from pretty severe rhinitis and pollen/mold/dust/outside allergies.

I also get them when I have a sinus infection, even a not obvious one in the back sinuses.

I never knew there were that many cases of under eye circles! I have them too, but they seem to be hereditary and allergy related. Ah well.