The Royal Lancaster Infirmary must "immediately rectify" staffing issues after an inspection found it had failed to comply with two warning notices.
The Care Quality Commission (CQC) call follows an inspection on 21 January to investigate if problems found in the previous October had been acted on.
"Further regulatory intervention" was also possible, the commission said.
The University Hospitals of Morecambe Bay NHS Foundation Trust said it was "already acting on the findings".
The October inspection found issues with the level of staffing in ward 39, which cares for patients with mixed medical conditions.
The CQC reported that staff shortages were linked to treatment errors and falls, and that patients had to wait too long for help. It then issued two warning notices.
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