Ar ddechrau'r pandemig, gohiriwyd y rhan fwyaf o apwyntiadau a thriniaethau er mwyn galluogi'r GIG i ganolbwyntio ar ofalu am y nifer fawr o bobl oedd â Covid-19. Mae’r tonnau dilynol o heintiadau coronafeirws hefyd wedi effeithio ar lefelau gweithgarwch yn y GIG.
At the start of the pandemic, the majority of appointments and treatments were postponed to enable the NHS to focus on caring for the large number of people with Covid-19. Subsequent waves of coronavirus infections have also affected activity levels in the NHS.