NASA Investigates Astronaut's Sudden Speech Loss Aboard ISS

NASA is investigating a medical incident involving astronaut Mike Fincke, who experienced a sudden loss of speech aboard the International Space Station (ISS) on January 7, 2026. The episode, which lasted approximately 20 minutes, prompted the first medical evacuation in the station's history. Fincke, a veteran astronaut with 549 days in space, was dining with crew members when he unexpectedly became unable to speak. He reported no pain during the incident.

"It was completely out of the blue. It was just amazingly quick," Fincke said.

The crew immediately contacted flight surgeons on Earth, and after assessing the situation, NASA decided to return Fincke and his three crewmates to Earth earlier than planned. The crew's Dragon capsule undocked from the ISS on January 14 and splashed down off the coast of California on January 15.

Medical evaluations have ruled out a heart attack and choking as causes of the incident. However, the exact cause remains undetermined. Doctors are considering potential links to Fincke's extensive time spent in weightlessness.

"My crewmates definitely saw that I was in distress," Fincke recalled. "It was all hands on deck within just a matter of seconds."

NASA continues to investigate the incident to better understand the health implications of long-duration spaceflight and to ensure the safety of future missions.