When I was not feeling well two days ago, I checked my blood pressure and it had gone up. It came back to normal quickly. But I don't know whether I was feeling bad because of my high blood pressure or the high blood pressure was because I was not well. I felt lethargic all day, although I was not very sick. The next day my blood pressure was normal but I was not well yet. Today, the third day, I'm feeling better but I have a little bit of headache. So my conclusion is that the high blood pressure was due to not feeling well, maybe due to some virus.