I have no experience with healthcare outside of Canada but as a kid I was always taken for routine checkups. As a young adult I don’t do regular checkups but that’s mostly because I’m lazy and finding a doctor who will agree to give you regular checkups can be difficult.
I did have an experience where my vision became blurred and I passed out. Someone called an ambulance for me and I was seen by a doctor as soon as I got to the hospital.
They did some basic tests and decided whatever it was it wasn’t immediately killing me so they referred me to a neurologist. Their office setup some appointments for me over the next week and I had all kinds of tests run. Then I was sent to a heart specialist who scheduled me for a bunch of tests the next week. At the end of it all both specialist decided I was perfectly healthy and I passed out because of an anxiety attack. They recommended I be less stressed. Thanks!
Between the hospital visit, the tests by the neurologist, and the tests by the cardiologist, I paid $45 for the ambulance and got my clean bill of health in about 2 weeks.