More than 600 people may have suffered as a result of delays in outpatient appointments at the hospitals run by the Morcambe Bay Hospital Trust, which includes the Westmorland General in Kendal.
The trust has contacted 19,000 patients who had their outpatient appointments delayed to explain that their care may have been affected.
The University Hospitals of Morecambe Bay NHS Foundation Trust reviewed all outpatient appointments and found that 663 people may have been adversely affected as a result.
Sir David Henshaw, the interim Chair of the Trust, said:
South lakes MP Tim Farron has called for an apology to all the patients affected by the issue.
The Trust, has faced a series of reviews by health regulators Monitor and the Care Quality Commission (CQC), and has seen a drastic change in leadership over the past few months with the appointment at Sir David Henshaw as interim Chair of the Board and Eric Morton as the interim Chief Executive.
The problem with delays in outpatient follow-up appointments at the Trust was highlighted last year. Around 19,000 people had their outpatient appointment delayed and an additional 1,100 clinics were put on so they could be seen as soon as possible.
Tim is meeting Health Ministers to talk about issues at University Hospitals of Morecambe Bay NHS Trust.
Commenting, Tim said: