NuvaRing is a once-a-month vaginal contraceptive device that was approved for use in the United States in 2001. Although NuvaRing is proven 98% effective in preventing pregnancy, it has been connected with several serious, life-threatening side effects, such as deep vein thrombosis, blood clots, pulmonary embolysm, stroke, and heart attack. Symptoms of these potentially fatal side effects include difficulty breathing, faintness, numbness on one side of the body, chest pain, aspirating blood, feelings of anxiousness or nervousness, excessive sweating, vomiting, nausea, and swelling of the arms, hands, legs, or feet. Women who experience any of these symptoms while using NuvaRing should consult a physician immediately.