What are the common side effects of the nuva ring?

Effects of Nuva Ring. The nuval ring releases estrogen, and the side effects are the same as any woman taking extra Estrogens ie. The increased risk of increased blood clotting is the most serious, and can be seen in woman taking bcp. Other side effects can also be associated with extra estrogen such a spider veins, and slight defects of the liver's handing the excess estrogen.