Adolescent chronic illness is a multidisciplinary field of study investigating the complex interplay between chronic health conditions and the unique developmental processes of adolescence. This research domain examines the epidemiology, etiology, pathophysiology, and management of long-term health conditions manifesting or persisting through this critical life stage, alongside their profound physical, psychological, social, and educational impacts on affected young people and their families. A central characteristic of this field is its focus on the intersection of chronic disease management with key adolescent developmental tasks, including identity formation, peer relations, increasing autonomy, and transition to adult healthcare. The significance of this concept lies in advancing understanding and developing effective interventions to optimize health outcomes, well-being, and successful transitions for this specific population.