[randomstudent]

> A bloke my sister knows (she's a nurse), was diagnosed with 'hypertension not otherwise specified', at the ripe old age of 31. But they didn't catch it early because he 'felt fine'. He wasn't overweight unhealthy. But he needs new kidneys now!

It's possible that kidney disease caused hypertension in that case. It's pretty much impossible to prove which one came first in many cases. None of this argues in favor or against regular checkups, it was just something I thought was interesting to refer.