Doctors raise health concerns about astronaut after subtle clue

Doctors have raised concerns about astronaut Sunita Williams' health after looking noticeably frail in a new photo.

NASA released photos of Williams, 59, and fellow astronaut Butch Wilmore, 62,walking gingerly and greeting shaking hands with NASA personnel after undergoing a following their nine-month space saga.

Doctors in particular pointed to Williams' 'visibly thin' wrists, which they told DailyMail.com could be a sign of rapid , muscular wasting in her arms, and bone density loss.

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