I became aware of this issue probably 4-5 yrs ago thru health groups I'm a member of, including an iodine group. All our body tissues including breast tissues need iodine. When I have missed my daily iodine (Iosol is what I use) I end up with pain/tenderness. There is so much info out there and just bringing it to attention of anyone who cares about improving overall health.

http://www.lef.org/magazine/2011/10/...ciency/Page-01