NASA astronaut Mike Fincke shares experience of sudden illness on the International Space Station, leaving doctors without a diagnosis.

The astronaut who prompted Nasa’s first medical evacuation earlier this year said on Friday that doctors still do not know why he suddenly fell sick at the International Space Station. Four-time space flier Mike Fincke said he was eating dinner on January 7 after prepping for a spacewalk the next day when it happened. He could not talk and remembers no pain, but his anxious crewmates jumped into action after seeing him in distress and requested help from flight surgeons on the ground. “It was...