Mae Llywodraeth Cymru hefyd yn goleuo adeilad Parc Cathays ar Ddiwrnod Clefydau Prin eleni i godi ymwybyddiaeth o’r digwyddiad a’i waith i wella bywydau'r rhai hynny sy’n byw â chyflyrau prin.
The Welsh Government is also lighting up its Cathays Park building this Rare Disease Day to raise awareness of the event and its work to improve the lives of those living with rare conditions.