The season prominently features the lesbian couple Callie Torres and Arizona Robbins as a core plot driver, with their relationship strained by Arizona's leg amputation (decided by Callie), leading to Arizona cheating with another woman, Lauren Boswell, highlighting queer relational drama intertwined with trauma. A dedicated episode centers a transgender teen couple receiving care from Jackson and Alex, addressing trans healthcare access and hospital policies in a supportive manner.

Additional themes critique systemic healthcare issues, such as hospital bankruptcy, insurance denials post-plane crash, corporate buyouts, high surgery costs forcing ethical dilemmas (Owen skipping an expensive procedure), CDC investigations scapegoating Bailey, and Syrian doctors training for war zones, subtly positioning big healthcare and institutional inequities as antagonists. These elements shape character arcs, casting, and subplots without dominating the central grief/romance/medical drama from the plane crash aftermath, but their prominence aligns with identity politics and social justice messaging, earning praise for progressiveness in 2012 while accumulating to feel 'too gay' for some modern retrospective viewers.