(CNN) -- Former astronaut and US Sen. John Glenn, 95, was hospitalized "more than a week ago," according to Ohio State University spokesman Hank Wilson.

"Sen. Glenn is at The James Cancer Hospital at The Ohio State University (and) was admitted there more than a week ago," Wilson wrote in an email. "I do not know his condition or illness or prognosis. I caution that even though Sen. Glenn is at The James that does not necessarily mean he has cancer."

Glenn had heart valve replacement surgery in 2014.

He became the first American to orbit the Earth in 1962.

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