Understanding High-Functioning Depression: A Narrative Review of Diagnostic Challenges, Nosological Frameworks, and Clinical Implications

Author(s):

Promise U Okereke*, Chukwuemeka V. Umeh, Egide Ndayambaje, Yusuf Popoola, Obinna Ikegwuonu, Chiemezie V. Aroh, Oladayo D. Akinwale, Mohamed Terra, Adaigwe C. Nwaigwe, Onyekachi M. Agbo, Evans P. Edomwonyi, Emovon A. Osasuyi, Stella N. Okereke and Wisdom O. Okereke

Background: High-Functioning Depression (HFD) refers to individuals who experience clinically significant depressive symptoms while maintaining outward functional competence in occupational, academic, and social domains. Despite growing recognition in clinical discourse, HFD remains absent from formal diagnostic systems such as the Diagnostic and Statistical Manual of Mental Disorders-5 (DSM-5) and International Classification of Diseases-11 (ICD-11), contributing to diagnostic ambiguity and therapeutic neglect.

Methods: A narrative review was conducted using PubMed, Science Direct, Google Scholar, the Cochrane Library, DOAJ, WHO reports, and African Journals Online (AJOL), incorporating literature published between 1st January 2010 and 31st December 2025. Search terms were supplemented with ICD-10, ICD-11, and standardized diagnostic tool terminology. Thematic synthesis was organized across four domains: (1) diagnostic ambiguity and nosological frameworks, including DSM-5, ICD-10, and ICD-11 criteria; (2) coping mechanisms and psychological resilience; (3) stigma and self-concealment; and (4) treatment approaches and adherence barriers.

Results: HFD is frequently underdiagnosed due to its non-disruptive presentation, sociocultural stigma, and internalized norms of self-reliance. Both DSM-5 and ICD-10 anchor diagnostic validity to functional impairment, inadvertently excluding this population; ICD-11 offers partial but insufficient improvement. Widely used assessment instruments, including the Beck Depression Inventory (BDI), Patient Health Questionnaire-9 (PHQ-9), and Hamilton Rating Scale for Depression (HAM-D), demonstrate a structural bias toward symptom-driven functional disruption, limiting their sensitivity for HFD. Cognitive-behavioural therapies, mindfulness based interventions, and lifestyle modifications demonstrate efficacy in subclinical depression but require tailoring to HFD profiles marked by perfectionism and emotional suppression. Pharmacological adherence is further complicated by diagnostic invalidation and stigma.

Conclusion: HFD challenges traditional models of psychiatric diagnosis and care delivery. Clinical systems must move beyond binary impairment criteria to recognize subthreshold, functionally masked mood disorders. Longitudinal and cross-cultural studies, alongside HFD specific psychometric tool development and nosological reform, are essential priorities for this underserved population.