Can the mirena coil cause hair thinning?
Very unlikely indeed. Mirena releases such a small amount of progesterone that it very rarely causes side-effects. The hormone is released directly into the lining of the womb, so does not enter the blood, and doesn’t cause side-effects like hair thinning. I’d stick with Mirena, if I were you. It’s the contraceptive that’s least likely to produce side-effects, and is the most effective one, too.