現代精神医学における抑うつ気分：診断的認識を必要とする忘れられた感情状態

Dysphoria - characterised by irritable tension, pervasive discontent and aversive emotionality - is a clinically significant yet nosologically ambiguous phenomenon. It remains marginalised in major diagnostic systems (DSM-5-TR, ICD-11), relegated to a symptomatic descriptor rather than a validated entity, perpetuating diagnostic imprecision and therapeutic risks.

This review argues for the formal recognition of dysphoria as a distinct transdiagnostic affective dimension. It synthesises evidence to demonstrate its neurobehavioural correlates, protean manifestations across disorders and the clinical imperative for its operationalisation within dimensional frameworks.

We conducted a synthesis of evidence across neuropsychiatry, phenomenology and diagnostic research. Historical typologies (e.g. directionality (extrapunitive versus intrapunitive), temporality (paroxysmal versus chronic) and structural complexity) and contemporary dimensional models (e.g. RDoC's Negative Valence Systems) were critically examined.

Dysphoria manifests heterogeneously across conditions: as paroxysmal hostility in epilepsy (e.g. interictal dysphoric disorder), affective estrangement in schizophrenia (irritability blended with detachment) and core dysregulation in personality pathology (e.g. borderline emptiness, antisocial hostility). Its exclusion as a primary construct leads to diagnostic inaccuracy (misattribution to depression or behavioural disorders) and iatrogenic harm (e.g. antidepressant-induced agitation). Historical typologies retain clinical utility for risk assessment and treatment planning.

Operationalising dysphoria within dimensional frameworks is essential to elucidate its unique pathophysiology, mitigate iatrogenic harm and advance targeted interventions. Formal recognition of dysphoria as a distinct construct is an ethical and clinical imperative - failure to do so perpetuates diagnostic imprecision, therapeutic missteps and preventable suffering.