Uncertainty about the nature of illness – which came only hours after reporting dire fourth-quarter results and his bank's first post-war loss – sent Deutsche's shares down 3 per cent in early trading in Frankfurt.
The shares, however, rallied later when details of the illness were published and the bank announced Mr Ackermann was back at work after visiting hospital on Wednesday night.
Mr Ackermann said he became ill after a bank reception in Berlin following a day of explaining the bank's losses to analysts and journalists.
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