LAUSR

OBJECTIVE Around 30% of people with long-term physical health conditions (LTCs) experience comorbid anxiety and depression. For many, comorbid distress is linked to difficulties adjusting to the challenges of the LTC. The aims of this paper are to present a transdiagnostic theoretical model of adjustment to LTCs (TMA-LTC), demonstrate the application of this model in clinical practice, and highlight the distinguishing features of treating LTC-related distress compared to treating primary anxiety and/or depression. METHODS A systematic review (k = 21) was conducted to collate pre-existing evidence-based models of adjustment across LTCs. Models of adjustment for a range of LTCs were extracted and synthesised into a new preliminary TMA-LTC. Two expert consensus meetings were held, where experts rated the relevance and importance of all concepts within the models. RESULTS The TMA-LTC proposes that acute critical events or ongoing illness stressors can disrupt emotional equilibrium, and that whether a person returns to equilibrium and achieves good psychological adjustment depends on a number of cognitive and behavioural factors, as well as their interpersonal, intrapersonal, environmental and illness-specific contexts. A case study is presented to demonstrate the clinical application of this model in treating illness-related distress, highlighting how it overcomes roadblocks that may be encountered when working primarily within traditional mental health paradigms. CONCLUSIONS As an empirically and clinically informed model, TMA-LTC provides a useful guide for assessment, formulation and treatment in the context of psychological adjustment to LTCs. Future studies are needed to test treatments that have been developed based on TMA-LTC.