Staffing problems have forced Wells Hospital in Somerset to cut the opening hours of its Minor Injury Unit (MIU).
A shortage of nurses resulting from sickness and recruitment troubles means it will only run from 8am to 9.15pm, rather than around-the-clock.
Wendy Marshfield, Director of Operational Services, said the decision was not taken lightly.
"We looked at the use of the MIU in the late evening and early morning and found few people attended," she said.
The Mendip Primary Care Trust is working to recruit more nurses and is assuring patients that the reduction of opening hours in the MIU is temporary.
All other services at Wells and District Community Hospital remain unaffected.