Veteran NASA astronaut Mike Fincke has revealed new details about the mysterious medical episode that prompted the agency’s first evacuation from space earlier this year.
The incident occurred on January 7 aboard the International Space Station (ISS), when Fincke suddenly fell ill while preparing for a planned spacewalk.
“It was completely out of the blue. It was just amazingly fast,” Fincke said in an interview at the Johnson Space Center in Houston.
“All hands on deck” response.
Fincke described how the situation escalated within seconds, with his crew members immediately recognizing the distress.
“My crewmates could definitely see I was in trouble,” he said. “Everything was on board in seconds.
He recalled being unable to speak, although he felt no pain and does not remember the episode itself. The incident took about 20 minutes for him to recover.
Doctors are still looking for answers
Despite extensive testing, doctors have yet to determine the exact cause of the episode.
Fincke said medical teams ruled out a heart attack and confirmed he did not suffocate. However, other possibilities remain under investigation, including potential links to prolonged exposure to microgravity.
The astronaut had spent 549 days in space across missions and was more than five months into his last stay when the episode struck “like a very, very quick bolt of lightning”.
Role of ISS Medical Systems
The medical capabilities on board the ISS played a vital role during the emergency.
Fincke noted that the station’s ultrasound machine was used during the incident and has undergone numerous follow-up tests since returning to Earth. NASA is now reviewing medical data from other astronauts to identify similar cases.
Mission impact and early return
A medical emergency forced the cancellation of a planned spacewalk — one that would have been Fincke’s 10th — and led to the crew’s early return.
SpaceX flew Fincke and his crew back to Earth on January 15, more than a month ahead of schedule. After landing, they were taken directly to the hospital for evaluation.
Fincke expressed regret for the disruption, particularly for fellow astronaut Zena Cardman, who missed her first spacewalk.
Privacy and Ongoing Investigations
Fincke said he could not share other medical details and emphasized NASA’s commitment to astronaut privacy.
“The space agency wants to make sure that other astronauts don’t feel that their medical privacy will be compromised,” he explained.
NASA continues to investigate the case and is analyzing historical astronaut health data to determine if similar unexplained episodes have occurred in orbit.
“This was the space, not you”
The astronaut admitted that he initially felt responsible for the disruption caused by his illness.
“I was very lucky to be super healthy. So it was very surprising to everyone,” he said.
But colleagues — including NASA Administrator Jared Isaacman — encouraged him to stop blaming himself.
“It wasn’t you. This was the universe, wasn’t it?” they told him. “You didn’t let anyone down.
A rare reminder of the dangers of space
The unexplained incident highlights the unpredictable health risks astronauts face in space, even for seasoned veterans like Fincke.
Although he has since recovered and feels healthy, the case remains unsolved — offering a rare glimpse into the medical uncertainties of long-duration spaceflight.
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