Copper
"I wanted to try this because pills just were not working for me and I decided a non-hormonal IUD would be my best bet. Insertion was pretty painful and I had to rest for around 15 minutes before I could actually stand up and walk. I have had it for 3 months now and I am a person that will try something for as long as possible before I have had enough. Lower back pain, painful cramps, period that lasts 2 weeks where I bleed through super tampons in two hours, and spotting for the other 2 weeks. Crouching down for longer then 30 seconds as well as sitting on hard chairs means having painful cramps for the day. For this much pain, not worth it. Does prevent pregnancy though."