“Whilst we are doing everything we can to maintain as much activity as possible, some cancellations are unavoidable to allow us to prioritise urgent and emergency care and cancer patients.

“This is regrettable, but necessary to allow us to focus on the most seriously ill/injured of our patients.”

Patients due to attend Castle Hill Hospital in Cottingham, Hull Royal Infirmary, Diana, Princess of Wales Hospital in Grimsby and the hospitals in Scunthorpe and Goole, are being told to attend their scheduled appointments unless contacted.

They are also being advised to order repeat prescriptions, and use pharmacies, GP surgeries, walk-in and urgent treatment centres if needed.

Peter Sedman, the HHP deputy chief medical officer, added: “We fully appreciate that for some patients, this will not be the first time they’ll be having their appointment postponed and we appreciate how frustrating this is.

“I’d like to apologise to anyone affected, please be assured we are working to get you rebooked as soon as possible.”

United Lincolnshire Hospitals NHS Trust, which covers Lincoln County Hospital, Pilgrim Hospital, Skegness and District General Hospital, Grantham and District Hospital and County Hospital Louth, confirmed its resident doctors would be striking.

In a post on social media, the trust said it would contact people if appointments needed to be changed.

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