NHS England chief nursing officer Jane Cunningham has told ITV Daybreak that "people should not lose confidence in the [NHS 111] service."
At least 22 "possible serious untoward" incidents - including three where a patient died - relating to the new NHS 111 advice line, a health magazine reports.
The deaths are being investigated. NHS England is keeping a 'careful eye' on the service.
Ms Cunningham added: "The three individuals will clearly need to be investigated and we need to see what really happened in those cases."
More top news
It takes more than economic meltdown, the threat of roaring inflation and years of recession to knock Vladimir Putin off his stride.
According to state media, the villagers are now undergoing an education programme to stop discrimination against those infected with HIV.
The P&O Ferries chef suffered a heart attack during a "kinky sex game" in which he was wrapped head to toe in clingfilm and PVC sheeting.