ONE in three NHS staff would not recommend their hospital to family and friends, a survey discovered.
One in five quizzed said they are not satisfied with the quality of care they provide.
And more than a quarter reported seeing an error, near-miss or incident in the past month that put patients at risk.
Only one in three say their workplace has enough staff for them to do their job properly, the NHS England survey of 497,000 hospital and ambulance workers found.
Four in ten have felt unwell due to work-related stress and one in five has been bullied or abused by a colleague.
The pressure means one in three often thinks about quitting and one in five plans to search for a new role within the next year.
The findings come as doctors and nursing unions warn there are already more than 100,000 NHS vacancies.
Dame Donna Kinnair, from the Royal College of Nursing, said the results reveal a “cavernous gap” between staffing levels and demand for care.
She added: “The Government and NHS England must listen and redouble efforts to keep staff as well as finding thousands of new recruits.”
Sara Gorton, from union Unison, said: “With so few staff, it’s no wonder the pressures of working in the NHS are making so many health workers ill.”
Jonathan Ashworth MP, Labour’s Shadow Health Secretary, added: “These are quite staggering findings with huge implications for the quality of care patients receive.”
Baroness Dido Harding, of watchdog NHS Improvement, said the results “underline the need to improve NHS culture”.
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Neil Churchill, of NHS England, said: “Staff regularly go the extra mile for patients.
But it is equally important NHS trusts and foundation trusts are doing all they can to support our fantastic staff. We would expect all trusts to listen to the results from their staff survey and take appropriate action.”
Workers from 304 NHS organisations responded to the poll, which did not include GPs.