How high does the bp need to be before it causes headaches? I've recently had elevated bp(140's/80's), which may not sound that bad but its usually 20 points lower(in each direction). A constant headache (which wakes me up at night), nausea..(no vomiting), dizzy spells. Of course, I intend to get it checked out but I'm wondering if a bp(of those levels) could cause those same symptoms. Thanks.