I have been using the patch for about a year now. It works great, very convenient. But i was only putting in on my sides, down by my hip bone, switching from one side to the other. It was starting to cause sharp pains so I went to the doctor and they said change the spots more often. So I just put it on my lower back and THE PAIN IS HORRIBLE. I cant figure out if its the birth control or from sitting for long hours. But someone please let me know if you have the same side effects.