Patients are now being treated in a £2m extension at Chorley And South Ribble General Hospital.
Building work has been carried out alongside the accident and emergency department.
It has provided space for the urgent care service, where patients with “more minor, but still urgent, illnesses and injuries” will be treated.
Doctors and nurses will care for patients, allowing A&E to deal with more serious cases.
It will be easier for patients who are not sure where to go for help, as both A&E and the urgent care service are located in one place.
A spokesman for NHS Chorley And South Ribble Clinical Commissioning Group said: “This is key to helping to reduce pressure on the A&E department and to free up the staff there so that they can focus on emergency and life-threatening cases.
“The first phase of work to the building is now complete and is already being used to treat patients with urgent care needs. There are a number of clinical rooms being used, as well as new areas, including a children and families waiting area.
“The second phase of construction is expected to be completed by the end of September. In total the cost for the building is around £2m.”
There were plans for the out-of-hours GP service to be based there, but that has been put on hold while a review is carried out.
The spokesman said: “There is a national review of GP out-of-hours services and we will continue to work with our local providers as part of this review. This review does not affect the urgent care service at Chorley Hospital.”
The urgent care service is one of several things being done to ease the pressure on emergency services.
The spokesman said: “This urgent care service housed in the new building will continue to grow as part of an on-going plan to reduce pressure on emergency services, which is also dependent on increasing access for patients to services in the community and closer to home.
“Many of our local GP practices are now offering increased opening times and there are a number of schemes in place to make sure that only patients with emergency needs are taken to hospital.”