I had the IUD insertion after 3 months gave birth to my 2nd kids. It was working fine for the first 3 to 4 months. All the sudden, my whole body pain (like chronic pain). I took all kinds of pain killer medicine,...tried Acupunture, massage, anything, but nothing work. Doctors did not have solution. I faced the pain over 2 to 3 months. Came to my last thought, I had the IUD removed. My body pain slowly heal within a month. That difinitely was the side effect cause my body pain. I am a healthy person and exercise regularly.