The phrase "cancel operations" is correct and usable in written English.
You can use it to refer to cancelling an ongoing activity that requires effort, such as a business operation, a military operation, or even a recreational activity. For example: "I'm sorry, but we'll have to cancel operations on the new project due to lack of funding."
Doctors and nurses picketed outside hospitals, complaining about lacking clean water and having to cancel operations.
Forced to cancel operations, it transferred almost all of the patients in the 173-bed hospital to other medical centers.
Hospitals are being told to cancel operations to make way for the most seriously ill flu patients.
Sir Mike said struggling hospitals were becoming caught in a "vicious spiral", admitting too many patients, forcing them to open overflow wards and cancel operations.
The rising demand for care has already forced 15 hospitals in England to declare a major incident, cancel operations, call in extra staff and open extra wards to cope with the sheer number of patients.
It is reorganising which wards handle what types of patients in order to avoid patients admitted as medical emergencies having to "sleep out" – spend the night in wards that are unsuited to caring for their needs, notably those full of surgical patients – or cancel operations due to a lack of beds.
The super-agency and Victoria police were forced to cancel Operation Fortitude that was scheduled to take place at the weekend after a backlash from the community.
Pressure to cancel Operation Crossroads altogether came from scientists and diplomats.
Another four beds are being arranged, with more planned to operate at hospitals that are cancelling operations.
Cancellation of operations : Whether physicians registered cancelled operations as a complication.
Two-thirds of NHS trusts are in deficit and have cancelled operations and extended waiting times.
