The artist Yoko Ono, the widow of the late former Beatle, John Lennon, has been admitted to a New York-area hospital after complaining of severe flu-like symptoms, her West Coast-based spokesman, Elliot Mintz, said on Friday.

A fire department spokesman said an ambulance was called to Ono’s apartment building at 72nd Street and Central Park West in Manhattan around 9 pm on Friday.

Mintz denied US media reports that Ono, 83, had suffered a possible stroke or heart attack.

Ono’s son with John Lennon, Sean, tweeted that his mother had not had a stroke but that she was dehydrated and tired.

Ono has lived in the luxury apartment building on Manhattan’s Upper West Side since 1973.

Ono’s career as an artist has spanned more than five decades.

Ono, also an experimental musician and film-maker, was once described by Lennon as “The world’s most famous unknown artist: everybody knows her name but nobody knows what she does.”