THAT’S the part that really sucks!
Sorry you suffer from it too.
I wonder what goes wrong that we hear it though?
I’ve had heart tests and artery images because of this very problem.
Docs decided it’s just damage from old head injury and I’ve had it for many years now.
Almost wish it was something wrong with an artery that they could fix.
Have you looked at the images on your search engine? The artery almost touches the inner ear.
It’s amazing that everyone doesn’t have this issue. Maybe we are born with a “programming sub-routine” in our brain that allows us to ignore it, and some of us have somehow managed to switch it off.
It’s also possible that it is very widespread, and we just don’t know it yet.