Video shows Merkel gripping her arms as she is seen seemingly suffering tremors across her body.
Merkel was shaking this morning as she stood alongside President Frank-Walter Steinmeier.
The event was indoor and was celebrating the appointment of Germany’s new justice minister.
The 64-year-old was handed a glass of water but turned it down.
She also appeared fine when she arrived at the German parliament just 30 minutes later.
It came after she was compared to Hillary Clinton following a shaking fit in Berlin.
“Everything is taking place as planned. The chancellor is well”
Her spokesman later said she was fine and would attend the G20 summit in Japan.
He said: “Everything is taking place as planned. The chancellor is well.”
Merkel – the most powerful woman in the world – is a key figure in Europe.
And she is expected to play a role in ongoing neogtiations over Brexit with Britian’s new Prime Minister, either Jeremy Hunt or Boris Johnson.
It came after the German Chancellor was filmed trembling all over while standing next to the Ukrainian president, Volodymyr Zelenskiy, in Berlin.
After being asked about the previous incident, Merkel blamed it on dehydration, saying she was better after drinking a few glasses of water.
“Since then I’ve drunk at least three glasses of water, which I apparently needed, and now I’m doing very well,” she told reporters.
Her aides also dismissed health worries – but the latest episode has renewed speculation.
Merkel has been German chancellor since 2005, but in October stood down as leader of her Christian Democrat party.
She has vowed to carry on in her position with the next German election due between August and October in 2021.
The chancellor faces a grueling schedule in the coming days – flying to Japan for the G20 later on Thursday.
She will then head to Brussels for an EU summit on Sunday at which she will play a key role in trying to seal a deal on the distribution of the bloc’s top jobs for the next five years.