Buckingham Palace has confirmed that the Queen spent a night in hospital this week, after medical concerns forced her to cancel a trip to Northern Ireland.
News broke yesterday that Her Majesty had โreluctantlyโ cancelled the visit on medical advice, though royal experts said there was no cause for concern.
Today, a Buckingham Palace spokesperson revealed that the Queen went into hospital on Wednesday, the day she was meant to travel.
They confirmed Her Majesty stayed the night for โpreliminary investigationsโ but returned to Windsor on Thursday to rest.

Buckingham Palace has confirmed that the Queen spent a night in hospital.
(Getty)โFollowing 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, and remains in good spirits,โ the spokesperson said.
Itโs understood the Queen stayed in hospital overnight for practical reasons, rather than any major medical concerns.
Reports state that she was back at Windsor, at her desk and working by the following afternoon.
Her Majesty was supposed to travel to Northern Ireland on Wednesday afternoon but her trip was cancelled on doctorโs orders.
โThe Queen has reluctantly accepted medical advice to rest for the next few days,โ a spokesperson said on Wednesday.
โHer Majesty is in good spirits and is disappointed that she will no longer be able to visit Northern Ireland, where she had been due to undertake a series of engagements today and tomorrow.
โThe Queen sends her warmest good wishes to the people of Northern Ireland and looks forward to visiting in the future.โ
The cancellation came after weeks of events and engagements for the 95-year-old monarch, who has kept a busy schedule even after husband Prince Philipโs death.
She took time off over the summer for her annual trip to Balmoral, in Scotland, but returned to work soon after travelling back to Windsor.
Itโs expected that the Queen will remain at Windsor Castle for a few days to rest and recover after this latest medical scare.
Though royal commentators like ITVโs royal editor Chris Ship reported that the news โis โno cause for alarmโ about the Queenโs healthโ, some royal watchers are fearful.
At 95-years-old, Her Majesty is Britainโs oldest living monarch and has faced several health scares in the last decade.

At 95-years-old, Her Majesty is Britainโs oldest living monarch.
(Getty)However, all reports are that the Queen is in good health and there are no ongoing concerns for her wellbeing.
She is expected to return to public royal duties in the coming days, with the support of other senior royals like Prince Charles and Princess Anne.
Both have stepped up to support their mother since Prince Philipโs death and have been photographed with her at several royal engagements recently.