Copper coil (IUD) and lower back pain

The biggest change going from the pill to the copper coil for me is that period cramps became more painful and my period now lasts longer. However, after three months the pain settled down and now only occurs the first few days of my period, is less frequent and is easily controlled with paracetamol. The biggest advantage with this contraception is my boost in mood. No more mood swings, feeling low and my sex drive has improved. Great for anyone sensitive to hormones. I was worried about the insertion and nearly didn't go because of what others had told me but I had nothing to worry about. I was told to take paracetamol before the appointment, was given the anesthetic and was surprised by how quickly the process was. I asked the nurse, is that it? I wish I hadn't listened to others and got it done years ago.

For the first 3 months of Mirena coil, at ovulation time and period time I suffered massively with lower back pain on one side which spread into sever bloating which lasted for over a week at a time. I got so frightened there was something wrong that I ended up in A&e where they gave me scans, all clear, bloods, all clear. My husband noted the only change had been the coil. Even my doctor said she hadn’t heard that type of reaction but that it can take 3 months to settle. That was the third month and since then I have had no issues. Periods stopped immediately. It is working for me now but wanted to let people know this can happen as I googled so much to see if anyone else had had those issues. The coil is tricky.

I have used the copper coil for nearly 5 years and it hasn't caused any issues except for slightly heavier/more painful periods for the first 4-6 months after insertion. However, after using it for around 3 and a half years, it did fall out during one particularly heavy period (which I believe was brought on by stress). I had a new coil inserted on the same day and have since had no issues.