Royal College of Nursing (RCN) director Janet Davies told the BBC the findings were "very concerning but not surprising - we have been hearing about this for some time from nurses".
She added: "What we are finding is the pressures, particularly in hospitals and community areas, are getting greater as we have got more patients who are sicker coming through the system.
"We are seeing nursing posts frozen or cut in order to try and balance the books, it's obviously something we have been looking at for some time."
More top news
Britons have been warned to expect plunging temperatures and wet weather as remnants of Hurricane Joaquin hit.
George Osborne has recruited former Labour minister Lord Adonis to spearhead efforts to get Britain building again.
More than 20 people are feared injured after a British millionaire crashed his supercar into a crowd at a motor show in Malta.