The short answer
Most women feel strong period-like cramps for a minute or two during insertion, and some mild cramping for a day or so afterward. Inserting around day 3–5 of your period, when the cervix is slightly softer, and taking a pain reliever beforehand can help. The whole procedure takes only a few minutes.
Tell your doctor if you are anxious or have had a difficult exam before. See copper IUD and Mirena.
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Answered by Dami Women's Clinic (다미산부인과의원), Yeouido, Seoul · Dr. Ko Sang-hyun, OB/GYN. General information, not a diagnosis. Emergencies in Korea: call 119. Medical disclaimer · International Patient Center