Finland tracked every gender-referred adolescent in the country for up to 25 years. Their psychiatric needs didn't…

Finland tracked every gender-referred adolescent in the country for up to 25 years. Their psychiatric needs didn't improve after 'gender reassignment'. They surged. A landmark peer-reviewed study just dropped. Here's what it found. 🧵

The study, published this week in Acta Paediatrica, was led by Professor Riittakerttu Kaltiala of Tampere University Hospital. Kaltiala has run Finland's youth gender clinic since 2011. She also served on the UK's Cass Review advisory board.

Finland centralises all gender identity assessments to two university hospitals. Because health register reporting is mandatory and patients cannot opt out, the dataset captured the complete fate of every gender-referred adolescent in the country from 1996 to 2019.

The cohort of 2,083 individuals was compared against 16,643 matched population controls. Follow-up ran for up to 25 years. This is not a small study with convenient dropouts. It is the full national picture.

Among those who underwent medical "gender reassignment", the increase was stark. Feminising procedures: psychiatric morbidity rose from 9.8% to 60.7%. Masculinising procedures: from 21.6% to 54.5%. The procedures did not resolve the distress.

After adjusting for prior psychiatric history, all gender-referred adolescents — whether or not they had undergone procedures — faced similarly elevated ongoing risk. Approximately five times higher than male controls. Three times higher than female controls.

The authors noted plainly: in some individuals, the medical procedures "appear to be linked to deterioration in mental health." This is a peer-reviewed journal. This is the lead clinician of Finland's national gender clinic. These are her words.

The study also found that those referred after 2010 — when Finland saw a tenfold referral surge — arrived with far greater pre-existing psychiatric needs. 47.9% had already required specialist psychiatric treatment before their first clinic contact.

Among matched controls in the same period, that figure was 15.3%. The authors suggest the pattern may indicate that for some adolescents, mental health difficulties are presenting as concerns about gender identity — not the reverse.

The study's conclusion could not be clearer: "Psychiatric needs do not subside after medical gender reassignment." This is the finding the gender medicine movement has staked its entire ethical claim on. The claim has not held.

In Australia, two clinicians who raised these exact concerns faced regulatory action. Dr Andrew Amos was banned by AHPRA for questioning the treatments publicly. No finding of patient harm was made against him. @Jilliantweeting was suspended, then issued a termination notice.

Spencer's termination came one month before an independent panel was due to deliver its findings. That decision is now subject to legal challenge. The Finnish study adds to the evidence base both clinicians drew on when they spoke up.

The UK's Cass Review — a four-year NHS-commissioned inquiry — found the evidence base for puberty-suppressing drugs and cross-sex hormones in minors to be "remarkably weak." It rated Australia's child gender medicine standards 19 out of 100 for rigour of development.

Queensland has suspended the initiation of these treatments for minors until at least 2031. The federal government has tasked the NHMRC with updating clinical guidelines, with interim advice expected by mid-2026. The science is forcing the policy debate.

The Finnish authors' recommendation is precise: thorough psychiatric assessment and ongoing treatment, before and after any medical procedures. "Psychiatric needs must be adequately met." That is not what Australia's suspended clinicians were told when they said the same thing.

If you think whistleblowers like Jillian and Andrew shouldn't be silenced for pointing to the science, share the science, starting with this tweet:

Kurt Mahlburg@k_mahlburg · Apr 7, 2026

Finland tracked every gender-referred adolescent in the country for up to 25 years. Their psychiatric needs didn't improve after 'gender reassignment'. They surged. A landmark peer-reviewed study just dropped. Here's what it found. 🧵

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Access the study here: onlinelibrary.wiley.com/doi/10.1111/ap….