birth control
"I had this inserted about 3 years ago.  It was like having really bad cramping for the the remainder of that day.  After that irregular periods for about 6 months to a year.  I have not had any problems that I would know to be related to this.  My periods have pretty much stopped.  It is so easy and I don't even know its there.  My husband says every once in a while he feels the string but does bother him.  I love it!"