You would expect astronauts to shrug off something as ordinary as plain travel sickness, but no: in fact most feel queasy for their first days in orbit, a common bout called space adaptation syndrome, and even veteran pilots get it

Why Earth motion sickness is no guideYou’d assume that whoever gets carsick on the ground will get spacesick in orbit, and whoever has an iron stomach will be fine. A 2025 NASA brief says someone who gets carsick may not develop space adaptation sickness, and vice versa. Space sickness was uncommon in the earliest cramped capsules and became more common once cabins were big enough for crews to float around. Jake Garn, a veteran Navy combat pilot with 17,000 flight hours, suffered one of the most notorious cases of space sickness. Whatever gives you grit against Earth motion doesn’t necessarily carry over.