David MacMillan, of the Pirate Dog YouTube channel, began feeling an ache in his upper arm in January but thought it was an injury from wrestling with his dad

David MacMillan died at the age of 30 earlier this month 

A 30-year-old school kitchen worker had no idea that some pain in his upper arm and shoulder was the first sign of a rare cancer that would soon cause his death.

David MacMilan chalked the pain up to an injury he had suffered in a fun arm wrestle with his dad at New Year.

But the pain failed to subside and he contacted his doctor.

At first he was assessed by a doctor and then a physiotherapist, reports Chronicle Live.

But the 30-year-old never got an appointment, as the country was plunged into the coronavirus lockdown.

As David’s health began to deteriorate in April his worried GP sent him to hospital where he was quickly diagnosed with a germ cell tumour, a very rare form of cancer that can be caused while a baby is developing in the womb.