Medical News Today -- Researchers in Norway have shown that high blood pressure is linked to fewer headaches, possibly due to having stiffer artery walls which affects a homeostatic process that regulates blood pressure and decreases sensitivity to pain. The study is the work of Dr Erling Tronvik, a neurologist with the Norwegian National Headache Center, Trondheim University Hospital, in Trondheim, Norway, and colleagues, and is published in the early online 15th April issue of the journal Neurology.