Disgrifiodd yr Adolygiad Seneddol y galwadau cynyddol a'r heriau newydd sy'n wynebu'r GIG a gofal cymdeithasol – mwy o anghenion gofal wrth inni heneiddio, newidiadau i ffyrdd o fyw, disgwyliadau'r cyhoedd a thechnolegau meddygol newydd. Mae'r heriau hyn wedi'u teimlo'n arbennig gan wasanaethau gofal critigol yn y blynyddoedd diwethaf ac maent wedi dwysáu ar adegau, er enghraifft yn ystod y gaeaf.
The Parliamentary Review described the increasing demands and new challenges that face the NHS and social care – greater care needs as we grow older, lifestyle changes, public expectations and new and emerging medical technologies. These challenges have been acutely felt by critical care services in recent years and these have been exacerbated at times, such as during the winter.