Can a mirena (levonorgestrel) iud lower estrogen and cause menopause symptoms?

Unlikely: Though taking high doses of Progesterone - like Depo Provera - can suppress estrogen levels, the amount of Progesterone in the Mirena (levonorgestrel) is a lot lower. So it would be unusual for it to cause hot flashes or night sweats. Those kind of symptoms can also be caused by stress and thyroid problems.

No: Mirena (levonorgestrel) does not work that way. It releases a small amount of Progesterone that works locally inside of the uterine lining and not throughout your body. It does not affect estrogen at all.