birth control
"I have had the IUD in since 2009,  it caused cramps for about 3 days, spotting then was normal. If works by causing your cervix to swell some and copper is a natural birthcontrol.

I confirmed with my doctor that the paraguard does not contain nickel before I had it placed.
Also you are warned before it's placement that many experience heavy bleeding and more cramps. In fact my cramps have lessened in the past few years. 

If your normal cramps keep you in bed, or cause you to buckle avoid IUDs always be open and honest with your doctors and older woman and woman who have had children tend to respond better."