Silvio Berlusconi, the former Italian prime minister, has collapsed while making a speech at a political rally in Tuscany.
Berlusconi fainted as he was delivering a closing address at a gathering of young centre-right followers and was taken off the stage by aides.
After spending 40 minutes railing against the government of prime minister Romano Prodi, Berlusconi suddenly started speaking slowly, looked weak and told the crowd: "And now, excuse me, emotion is getting the better of me, and I ..."
The 70-year-old then collapsed as aides rushed to support him.
Berlusconi, who overcame prostate cancer in the 1990s, said at his villa after leaving the rally that he was going to Milan's San Raffaele hospital where he would stay the night.
"They found something on the electrocardiogram, something like an irregular heartbeat, so they want to keep me under observation for 24 hours," he said outside the villa.
Initally, aides said he had a strong drop in blood pressure.
'Tension' blamed
Spokesman Paolo Bonaiuti later told RAI state TV: "Silvio Berlusconi had a strong drop in blood pressure, he's much better now."
Irene Pivetti, a former lower house speaker, said: "He felt unwell due to the tension, he is very sorry and wants to continue but the doctor has told him not to."
About 30 minutes after he fell ill, Berlusconi walked out of the hall in Montecatini Terme, a spa town in northern Italy, to a waiting car, waving to supporters of his Forza Italia party.
Berlusconi, Italy's richest man, went on trial last week charged with fraud at broadcaster Mediaset, which his family controls, the latest in a series of legal battles which have dogged him since he entered politics in 1994. He denies any wrongdoing.