I have had a variety of sensations, depending on coil position. With each new session’s first pulse if I have any serious discomfort (such as pain radiating down into face) the tech has made minor adjustments to the coil position to remedy that. The typical sensation for me is a firm tap on the scalp almost as though with a small hammer. It does not hurt, but I would not say it is pleasant. The one thing that happens to me that I am really unsure about is that my right hand and fingers violently twitch with each pulse….so no holding onto anything during treatment sessions.