Last month, Queen Elizabeth II of England postponed her annual holiday train voyage to Sandringham Hall due to illness.
The Queen and Prince Philip made the trip by helicopter 24 hours later, and the delay was downplayed by royal sources.
Is there something more to it than they're letting on, however?
Claiming that the monarch was simply waylaid by a bad cold, the palace sought to put a damper on any broader concerns.
But now it seems the long-ruling monarch's illness may be more serious than we've been led to believe initially.
The 90-year-old was scheduled to participate in her final royal engagement of the holiday season on Sunday - a church service at Sandringham.
Again, she wasn't feeling well enough to attend.
“Her Majesty The Queen will not attend Sunday worship at Sandringham today,” a statement from Buckingham Palace released yesterday read.
“The Queen does not yet feel ready to attend church as she is still recuperating from a heavy cold.”
A Palace spokesperson later went into slightly greater detail in response to a query from People magazine:
“Her Majesty The Queen will not attend Church at Sandringham this morning,” the statement read.
“The Queen continues to recover from a heavy cold and will stay indoors to assist with her recovery."
"Her Majesty will participate in the Royal Family Christmas celebrations during the day.”
The Queen has not made an official public appearance since December 9, when she hosted the ambassador of Liberia.
While Palace officials continue to insist there's no cause for concern, at 90 there's no such thing as a minor health problem.
Anyone who's looked at last year's list of royal engagements knows that the Queen keeps an incredibly busy schedule.
Unlike granddaughter-in-law Kate Middleton, she books a great deal of public appearances and very rarely cancels any of them.
Perhaps that hectic lifestyle simply caught up to her last month after such a long, productive, active and incredibly public run.
Or perhaps there's reason to be worried about the world's longest-reigning autocrat, who has been on the throne for over six decades.
Just last week, the Queen was the subject of a viral death hoax on Twitter, which prompted thousands of re-tweets and one harried denial from the Palace.
The Palace media team may want to get used to firing off those denials if the rumor mill gets any crazier than we've seen in the last 48 hours.
The royal health rumors aren't limited to HRM, either.
Sources close to the royal family say that 95-year-old Prince Philip, who has battled medical issues in the past, has also taken ill again of late.
In the event of the Queen's passing - not that we're implying this is anywhere near imminent - who would replace her in the line of succession?
Hint: Not her husband.
Despite marrying the Queen, Philip is way down on the list. Like Kate Middleton, marriage is the closest he's getting to actual power.
Prince Charles, 68, is the heir apparent to his mother. Prince William, 34, would follow, then his children George, 3, and Charlotte, 1.
Harry? He's nicknamed The Spare for a reason, after all. Mr. Meghan Markle has been bumped all the way down to fifth at this point!
Despite rumors that the tabloids love to recycle every so often, there's no reason anyone other than Charles would succeed the Queen.
That is, unless he voluntarily abdicated, which there's no way he's doing after waiting his entire life and weathering so many scandals.
We will have further updates on this developing story as more information becomes available, and continue to wish HRM the best in 2017.