A chronic staff shortage has left the NHS in Wales in a "dangerous and precarious state", a union has warned.
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BMA Cymru, which represents doctors, made the claim after Newyddion S4C saw evidence Cwm Taf Morgannwg health board was using Facebook to ask staff to work extra hours.
One employee, who asked not to be named, said morale was being affected by the lack of workers.
The Welsh government said it was trying to increase staff across Wales.
Cwm Taf Morgannwg health board confirmed it used "staff communication channels" to ask staff about working during busy periods when there were staff shortages.
Member of the Senedd (MS) Heledd Fychan said the health service was "clearly" under strain.
"To think the health board has to plead with staff to go into work to answer the demand, that is extremely concerning," the Plaid member for South Wales Central said.
Senedd Conservative group leader Andrew RT Davies called it "really concerning".
"Over 12,000 people are waiting two years or more to get treatment in this health board area," he said.
He added that without the necessary staff waiting lists would continue to grow.
The Royal College of Physicians (RCP) staff census showed there was pressure across Welsh hospitals.