The Japanese star, 83, was taken to Mount Sinai Roosevelt Hospital by an ambulance at around 9pm local time. She was found unconscious in her luxury apartment in Manhattan, according to the New York City Fire Department.
But publicist Elliot Mintz denied claims she had suffered a stroke. He told US media: "It was never ever a stroke. She was suffering extreme flu like symptoms." He added: "Her doctor thought it would be a good idea to go to a local hospital to be checked out. She went to hospital. She is being checked out."
The star's only son, musician Sean Lennon, also dismissed the stroke rumours on social media. He told his 190,000 Twitter followers: "Hey guys it was only rumours from press: was not a stroke, just dehydration/tired." He added: "She is fine. Thank you everyone for your concern."
Ono has lived in the luxury apartment building at 72nd Street and Central Park West since 1973.
Lennon was shot and killed in front of the building by crazed fan Mark David Chapman in December 1980.
The Imagine hitmaker was pronounced dead at the same hospital Ono has been taken to, then known as Roosevelt Hospital.
By: Tom Parfitt
Source: Daily Express
Let me preface this by saying that I don't want to freak anyone out. I don't want to make any rumors worse, but the bit about "extreme flu-like symptoms" is reminding of heart health information from an event a hospital in my area gave out a Girl Scout event a few years back (I was in high school at the time) and something that happened to a family member years ago (I was too young to be told the full story, but I remember my parents mentioning this after the Girl Scout event.)
Did the hosptial test to see if she'd had a heart attack? Women's heart attacks don't always present the same symptoms as men's heart attacks, and it's very common to manifest with symptoms similar to the flu.