“Her Majesty is in a good mood and is disappointed not to be able to go to Northern Ireland, where she was to undertake a series of engagements today and tomorrow,” the palace statement added.
“The Queen sends her warmest wishes to the people of North Ireland, and look forward to visiting in the future. “
The 95-year-old monarch was supposed to make a two-day trip to the country from today.
Sky News royal correspondent Rhiannon Mills recently arrived in Belfast ahead of the Queen’s scheduled visit.
She said Buckingham Palace had made it “very clear that she was following the advice of the royal medical family”.
“They told her that she needs to rest for the next few days, but we are also told that she is in a good mood,” said Rhiannon Mills of Sky.
“In many ways it’s probably not surprising that they told her to rest because the past two weeks have been incredibly busy considering she’s 95 years old.
“Yes, she has all the best help around her and she leads a very privileged life but for 95 years she has had a very busy work schedule. “
The decision comes just days after it was seen using a walking stick at a major public event while attending a service at Westminster Abbey marking the centenary of the Royal British Legion, an armed forces charity.
Sky News understands she was due to visit Hillsborough Castle to mark her recent name change to Hillsborough Royal Castle this afternoon.
The queen was also due to meet some COVID-19[feminine[feminine heroes of the pandemic.
There are reports that the monarch was due to attend a special ceremony at the church tomorrow, recognizing the centenary of Northern Ireland.
After being informed that the Queen will not be visiting Northern Ireland, the group of church leaders said: ‘We are very sorry to hear that it will not be possible for Her Majesty Queen Elizabeth II to be there for the Reflection and Hope service in Armagh tomorrow.
“We wish to convey our best wishes to Her Majesty and in doing so, recognize the importance of her commitment to the work of peace and reconciliation, which has meant a lot to the people of this island.
“We hope that the service of tomorrow will be an opportunity to continue this work, emphasizing our common hopes for the future. “
On Tuesday evening, the Queen hosted a major global investment summit at Windsor Castle, where Rhiannon Mills said she “looked like a fantastic spirit”.
“Of course now that she is older, and of course now that Prince Philip is no longer by her side, we are seeing more and more royals around her, also last night we saw Prince Charles and Prince William, ”she added.
It is understood that the Queen’s decision is unrelated to the coronavirus and now rests at Windsor Castle.
At this point, the monarch is still expected to attend events related to the COP26 Climate Change Conference in Glasgow at the end of the month.