If you are not from the US, remember that healthcare here is not a right, often treatments can be gated behind if your insurance approves (so telling them you did something like is intimidating), and is terribly expensive. They are also doing something they may be ashamed of. As someone who has worked in healthcare at one point, I can promise you that we see a lot of things that could have been fixed with a pill or a minor surgery turn into full blown long term problems because people are embarrassed about their issue.
I’m not saying I agree with it, but I understand why they chose not to go to the doctor.