Where ever the pain is under my hat or tape it to my forehead if the pain's there. My wife had a radiation injected to test for heart problem and the nurse said she will be getting a bad headache from it. I had a patch on my back that I taped to her forehead and told the nurse to hold off on ordering pain meds for 20 minutes. 20 minutes passed and the headache was gone as usual.
Another thing is my wife absolutely hates to take pain meds so she was glad that I was there with my patch. We never use medication anymore. Everything we use is natural. I consider pulsed electro magnetic natural as well.