He suddenly couldn't speak in space. NASA astronaut says his medical scare remains a mystery

Why it matters: This unexplained medical event highlights critical unknowns about human health in long-duration spaceflight.
- Mike Fincke, a four-time space flier, suddenly lost his ability to speak while on the International Space Station, leading to an emergency medical evacuation.
- Doctors have ruled out a heart attack and choking, but the cause of Fincke's 20-minute episode remains a mystery, potentially linked to his 549 days in weightlessness.
- NASA is reviewing other astronauts' medical records to identify any similar incidents, emphasizing medical privacy while investigating the unprecedented event.
- Fincke's illness led to the cancellation of a spacewalk and the early return of his crewmates, though he still hopes to return to space despite the scare.
NASA astronaut Mike Fincke experienced a sudden, unexplained medical emergency in space, losing his ability to speak for 20 minutes, prompting the agency's first medical evacuation from the International Space Station. Despite extensive tests, doctors remain baffled by the incident, which Fincke describes as a "lightning bolt" that struck without warning.

