When I read about this I got really scared because I have a blot clotting disorder and estrogen causes blood clotting. I called my doc and asked him if it could be possible that I have extra estrogen in my system. He said estrogen dominance doesnt mean you have MORE estrogen in your system than normal. It just means the balance between Progesterone and estrogen is off and you have more estrogen OVER progesterone than normal. Does that make sense? He is a really good doctor although he denies mirena is causing all these problems.