How does NASA ensure that astronauts going into space for months at a time don’t get sick?

Question

I assume the astronauts are healthy, thoroughly vetted by doctors, trained in basic medical principles, and have basic medical supplies on board.

But what happens if they get appendicitis or kidney stones or some other acute onset problem?

In: 2048

Answer 1

Screening is rigorous, but some astronauts do come down with space rashes. This is because the redistribution of blood and liquids in you body alter your immune system regulation and some latent viruses will emerge while in space. The result is a rash.
[Space Rash](https://www.sakshipost.com/news/why-astronauts-develop-skin-rashes-viral-infections-space-203584)