Milo Simpson, a resident doctor in acute medicine at the Royal Sussex County Hospital in Brighton joined the picket line.
He said: “I do not want to be out on strike today – I’d much rather be at work.
“However we cannot have this this jobs crisis we’re facing at the moment and this recruitment and retention crisis due to pay erosion.”
This is the 14th walkout by resident doctors in a long-running pay dispute.
Dr Gareth Roberts, a respiratory consultant at Frimley Health NHS Hospitals Trust in Surrey, says the impact of the strikes will be felt across the NHS.
He said: “All members of our staff across the whole of the organisation do become involved in the industrial action and there’s colleagues of mine who are making those difficult phone calls to patients to tell them their appointment or procedure have either been cancelled or re-arranged.
“That obviously that puts a lot of pressure on those people as well.”