Almost half of 25,000 working people say they have experienced trauma or distressing situations at work, a survey has found.

And just under a third (31 per cent) said they had experienced violence after being abused, threatened or assaulted by clients, customers or co-workers.

The peak national union body, the Australian Council of Trade Unions, will on Monday release the findings of its survey of more than 25,000 workers.

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