My blood pressure may be very similar to a computer cooling fan.   It is telling me my brain is working hard on something.    Like in the second computer fan example, it may be doing something unnecessary, and something I didn't even realize would be happening.    When I see spikes in my high blood pressure, it is telling me I am thinking about something too hard.   If I don't recognize it, it might be subconscious.

This episode is also available as a blog post: http://hypothesis-discovery.com/2021/05/18/blood-pressure-and-thinking-too-much/