"i have been on the nuvaring for a little over 3 months (because my doctor made me see if it would get better although i tried to change to something else less than a month in). i have gained 15 pounds, lost my sex drive, and have been extremely moody and unable to feel like myself. however i would have to say the worst side effect is the breast tenderness. i have been on many different birth controls and this one has more unpleasant side effects than any other birth control."