As I understand it, any chronic conditions that would impact an astronaut's ability to do their job would disqualify them. There's just too much at stake and to

As I understand it, any chronic conditions that would impact an astronaut's ability to do their job would disqualify them. There's just too much at stake and too much competition for the spot. IBS isn't explicitly listed as a disqualifier like diabetes or heart disease but I doubt it would fly with NASA, especially since it tends to get worse under stress.