Quality of life is often treated in clinical medicine as an outcome that improves when symptoms, impairment, or disease activity improve. That assumption is useful but incomplete. People can experience substantial symptom burden while retaining meaning, valued roles, relationships, agency, and social participation, while others can achieve biomedical stability yet remain unable to live in ways they regard as worthwhile. This article develops a proposed multidimensional theory of quality of life that distinguishes symptom burden from meaning, identity continuity, relational belonging, participation, and autonomy within social and material opportunity. The model treats these dimensions as analytically distinct but dynamically interdependent. It also separates capacity from realized participation, autonomy from unsupported independence, and adaptation from simple acceptance. Quality of life is therefore framed not as a residual subjective score after clinical outcomes are counted, but as an evolving appraisal of whether a person can sustain or reconstruct a life experienced as viable and valued. The framework remains explicitly non-empirical: it organizes evidence from patient-reported outcomes, illness identity, social support, participation, person-centred care, and measurement research into testable propositions rather than claiming validation. It further identifies response shift, inequitable opportunity, cultural context, organizational design, and measurement choice as boundary conditions for clinical interpretation.
