NASA will host a live news conference on Thursday afternoon from the agency’s headquarters in Washington to discuss the International Space Station and its crew.

NASA will discuss events that led to its decision to postpone the agency's first spacewalk of the year outside the International Space Station.

A planned spacewalk outside the International Space Station was scrapped because of what NASA called a "medical concern" with an unidentified crew member.

JOHNSTON SPACE CENTER — During an early morning press conference, NASA Administrator Jared Isaacman revealed on Thursday that a Crew-11 astronaut suffered a “serious medical condition” while onboard the International Space Station last week.

NASA administrator Jared Isaacman said in a press conference that “a single crew member on board the [ISS] experienced a medical situation and is now stable,” but NASA is playing it safe and bringing Crew-11 home early.

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Nasa and SpaceX are preparing for the first ever medical evacuation of the International Space Station ( ISS) after an astronaut suffered an undisclosed health crisis. The Crew-11 mission will return to Earth on Wednesday, several weeks ahead of schedule, due to a “medical concern” with a crew member.

A Crew-11 member, who NASA has yet to identify, had an undisclosed medical concern that triggered the agency to accelerate their return to Earth.

After an unidentified astronaut suffered a medical issue, NASA made the call to return Crew-11 early from the ISS. Here's what we know.