Medical Adolescence: A Proposed Framework for Understanding Adolescent Development Under Conditions of Significant Medical Complexity

Medical Adolescence is a proposed conceptual framework for understanding how significant medical demands may alter adolescent development by displacing developmental time and opportunity. It is defined as the loss, distortion, consumption, interruption, or replacement of developmental time and opportunity caused by significant medical demands during the developmental period in which identity and related developmental capacities are actively forming. The paper proposes the developmental collision as a general mechanism through which developmental opportunity may be displaced, with Medical Adolescence representing the specific subset in which medical demand is causally responsible. It introduces a decision procedure for distinguishing expression friction, developmental gaps, developmental collision, and Medical Adolescence, while separating the adolescent's immediate developmental response needs from the etiology of the developmental gap. The framework is positioned in relation to adolescent development, stage-environment fit, pediatric-to-adult healthcare transition, illness intrusiveness, biographical disruption, and identity development literature. Medical Adolescence is proposed as a developmental phenomenon requiring empirical investigation, not as a diagnosis, validated clinical instrument, or established empirical finding. This Version 1 preprint presents the initial formal conceptualization of Medical Adolescence and identifies priorities for future empirical testing.