HI there! I have had a SCS implanted for upper extremity pain. The control unit is in my left buttock and the wires run up the spinal column to the nerve bundle in my neck. This is where the doctor can attach the leads on the nerves that need the stimulation. I rarely feel the leads in my neck unless I am having a horrible day, or sleep crooked. I have lost a lot of weight recently and am having some discomfort from the control unit. Hope this helps some and gl, Lisa