People are being urged to use other healthcare services, rather than the A&E department at the Royal Lancaster Infirmary.
Foluke Ajayi, chief operating officer at University Hospitals of Morecambe Bay NHS Foundation Trust, said: “We are currently experiencing increased pressure in our A&E at the RLI, and we are calling on the public to again help us.
“We do occasionally experience sudden increases in attendance which can impact on the time for patients to be seen, treated and either discharged or admitted.
“At the moment, patients are likely to experience long waiting times, whilst those who need urgent treatment are seen first.
“Please help us make sure our staff are free to treat those most in need, such as those who have a serious illness or injury.”