I had a high blood pressure reading at a routine pain management visit to my practice nurse when I was 36. It was 220/180. No symptoms, just a period of louder than usual chronic pain (I have a spinal congenital defect that’s lots of fun).
Nurse left to get Dr, Dr thought the electronic bp meter was faulty, tried 2 others & old fashioned manual meter, still the same result.
Lots of visits before so not White Coat Syndrome. In fact, my regular bp was 110/70 so this was rather volcanic by comparison. Lots of exercise, had a very physical job, cycled & walked everywhere. Lots of investigation, no underlying cause (apart from pain caused by shonky spine).
Down to a lovely 130/85 now (pain even worse, but that was 14 years ago & I’m older & more decrepit). Blood tests every 6 months for liver & kidney function, I take lisinopril, amlodipine & indapamide. I do a week of home testing every year to get an overall average reading, testing twice a day.
Buy a good electronic bp monitor (I think my last one was on a lightning deal on Amazon for about £40 a couple of months ago, can’t remember the brand, but some GPs prefer some manufacturers over others, mine provide a recommended list). My practice advises you change monitors every 3-5 years. Also, make sure the cuff is large enough (big biceps here lol!).