Comedy legend Robin Williams has cancelled four stand-up shows in Florida amid fears for his health.

A statement on the actor's website said: "Williams was experiencing shortness of breath and is currently being evaluated by doctors who are recommending a week of rest."

Health fears ... Robin Williams has been rushed to hospital.

The four performances of Williams' tour are being rescheduled.

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Williams is renowned worldwide for his madcap style of stand-up comedy, which has also characterised his long and successful movie career.

In recent years he has also made a name for himself as a serious actor, winning an Oscar for best supporting actor for his performance in .