Tony Blair's eldest son Euan has been taken to hospital in Barbados suffering from stomach pains, Downing Street said today.
The 22-year-old was apparently taken to the Queen Elizabeth Hospital near Bridgetown yesterday, but has not undergone surgery and his condition is not believed to be serious.
A Downing Street spokeswoman said: "We can confirm that Euan Blair was taken into hospital with a stomach complaint."
The Prime Minister arrived back in Britain from the family holiday this morning, and is said to be working in Number 10.
Professor Andrew Zbar, a doctor at the hospital, said it was "a bit of a non-story".
He said he hoped Mr Blair's son would be well enough to be discharged today, but would not give any further details.
The Blairs have been enjoying a three-week break in the Caribbean, including a stay at Sir Cliff Richard's holiday home.
Mrs Blair is understood to have remained in Barbados with her son as he recovers.
Euan recently accepted a place at prestigious US college Yale to do a two-year masters in international relations.
In May he carried out an unpaid internship in Washington, after completing his undergraduate ancient history degree at Bristol University.