The Queen spent the night in hospital for tests after canceling official duties.
Royal doctors sent the 95-year-old sovereign to be seen by specialists in London on Wednesday afternoon.
Her Majesty was discharged — with Buckingham Palace saying she was in “good spirits” after “preliminary investigations” during her visit to hospital.
It was believed her medical team acted out of caution to have her admitted on Wednesday.
And the overnight stay — her first in a hospital for eight years — was for practical reasons.
Yesterday afternoon Her Maj, 95, was understood to be back at her desk at Windsor Castle.
She was said to be reading her official government red boxes and is expected to recuperate for the rest of the week.
The Palace said: “Following medical advice to rest for a few days, the Queen attended hospital on Wednesday afternoon for some preliminary investigations, returning to Windsor Castle at lunchtime today [Thursday] and remains in good spirits.”
It was believed the Queen stayed the night at the unnamed London hospital only as it was getting too late to take her on a 26-mile trip home.
