Gender Dysphoria Preceding Intersex Recognition Demonstrates a Biophysiological Basis for Sex Identity

TL;DR

Intersex individuals are more likely to experience gender dysphoria, suggesting a biological link between sex variation and gender identity.

Contribution

The study reveals a biophysiological basis for sex identity through the elevated and earlier occurrence of gender dysphoria in intersex individuals.

Findings

Intersex individuals have nearly four times the rate of gender dysphoria compared to the general population.

Gender dysphoria preceded intersex recognition in 47% of cases, indicating delayed diagnosis.

Intersex individuals are diagnosed with gender dysphoria at older ages than non-intersex individuals.

Abstract

Intersex individuals—those born with congenital variations in sex characteristics (VSCs)—experience elevated and underrecognized clinical risks. In an analysis of 3.42 million electronic health records, we identified 2,207 intersex patients, of whom 2.95% were diagnosed with gender dysphoria (GD)—nearly four times the rate in the general population (OR = 3.84, p < 0.001). In temporally resolvable cases, GD preceded intersex recognition in 47% of patients. Intersex individuals also received GD diagnoses at significantly older ages than non-intersex peers (median 32 vs. 26 years), with a broader and more variable age distribution. These patterns suggest delayed recognition, elevated psychosocial burden, and systemic misalignment between clinical frameworks and patient realities. Despite clinical recognition of both intersex traits and GD via long-established ICD codes, recent policies increasingly define sex as binary and reframe GD as a behavioral concern. Our findings suggest a biophysiological link between sex variation and gender identity distress, underscoring the need for care models that resist institutional erasure and systemic exclusion.

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