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In recent decades, the rise in psychiatric diagnoses has prompted growing concern among scholars, clinicians, and policymakers about the epistemic foundations and societal implications of diagnostic expansion. This panel explores overdiagnosis as a critical phenomenon through the lens of diverse epistemological frameworks—ranging from biomedical classifications to experiential knowledge, critical psychiatry, and feminist critiques of science. We focus particularly on the proliferation of autism and ADHD diagnoses, which reflects a broader global trend in the medicalization of behavior, emotion, and attention.The tsunami of autism and ADHD diagnoses exemplifies the tensions between standardized diagnostic systems such as the DSM and ICD, and the situated practices of clinicians, educators, and patients. Despite being framed as a neurodevelopmental disorder with high heritability, autism and ADHD lack clear biological markers, relying heavily on self-reported symptoms, and are subject to wide geographic variation in symptom prevalence and report even within homogeneous healthcare systems.This panel interrogates how diagnostic categories come to be seen as ‘normal’ and how they shape both everyday subjectivities and institutional practices. We critically engage with late-onset ADHD as an emerging category, ADHD, autism, and the blend of both: AuDHD speculating why the wave of diagnoses of these conditions in the 1990s has turned into tsunami.Four short presentations will be followed by group discussions and ends with an expert roundtable debate of the topics the group discussions raise:A. Jønsson: Self-diagnosing against doctors’ conclusionsG. Russell: ‘Do I have autism?’ The effect of tests on-line on diagnosis ratesS. Lundstrøm: Reasons for de-diagnosingJ. Brodersen: Parental reasons for seeking an ADHD diagnosis for their child