Geraint was told that he had kidney failure caused by vasculitis, inflammation of your blood vessels, which had caused swelling in his shoulder and had caused his kidneys to shut down.
Dywedwyd wrth Geraint bod ei arennau wedi methu oherwydd fasgwlitis, sef llid ar eich pibellau gwaed, a oedd wedi achosi chwydd yn ei ysgwydd a methiant yr arennau.