Summary

The Cass Review was set up after referrals to England's child gender service rose sharply and the patients changed to mostly teenage girls, many with autism or mental health problems. Its final report found that care had rested on 'remarkably weak' evidence. Reviews by the University of York could draw no conclusions on how puberty blockers (drugs that pause puberty) affect gender distress or mental health, and found only limited evidence for hormones. Cass recommended whole-person assessment, standard psychological support, blockers only in a research trial, 'extreme caution' with hormones before 18, national review of every medical case, and regional services. It is the most thorough review of its kind, and later reviews agree the evidence is weak. Its methods are disputed, critics and defenders both have stakes, and some advice rests on judgement rather than data.

Key findings

• أنشأتها الخدمة الصحية الوطنية الإنجليزية عام 2020 ونُشر التقرير النهائي المؤلف من 388 صفحة في 10 أبريل 2024، ويقدم 32 توصية لخدمات الجندر للأطفال والشباب في إنجلترا.
• نظرت مراجعة جامعة يورك لحاصرات البلوغ في 50 دراسة (1 عالية الجودة، 25 متوسطة، 24 منخفضة). وقالت إنه لا يمكن استخلاص استنتاجات بشأن الآثار على الكرب الجندري أو الصحة النفسية أو نمو الدماغ، وإن صحة العظام والطول قد يتضرران.
• نظرت مراجعة يورك للهرمونات المغايرة في 53 دراسة (1 عالية، 33 متوسطة، 19 منخفضة). ووجدت أدلة متوسطة الجودة على أن الصحة النفسية قد تتحسن أثناء العلاج، لكن لا يمكن استخلاص استنتاجات بشأن الآثار الأخرى.
• توصي المراجعة بتقييم شامل للشخص، يشمل فحوصاً للتوحد وحالات مشابهة وتقييماً للصحة النفسية، مع علاجات حوارية معيارية ومثبتة وأدوية للكرب والحالات الأخرى.
• ينبغي ألا تُعطى حاصرات البلوغ إلا ضمن دراسة بحثية (وقد أخذت الخدمة الصحية الوطنية الإنجليزية تجربة إلى الأمام). والهرمونات من سن 16 تحتاج «حذراً شديداً» وسبباً واضحاً لعدم الانتظار حتى 18، ويجب أن تُحال كل حالة علاج طبي إلى لجنة خبراء وطنية.
• وجدت المراجعة أن الإرشادات، ومنها إرشادات WPATH (الرابطة العالمية المهنية لصحة المتحولين جنسياً)، لم تُعدّ بعناية. ورفضت ست من سبع عيادات جندر للبالغين تابعة للخدمة الصحية الوطنية مشاركة البيانات لدراسة عن النتائج طويلة الأمد، وتقول المراجعة إنه ينبغي إلزامها بالمشاركة.
• ينبغي للأسر التي تقرر بشأن التحول الاجتماعي (اسم جديد أو ملابس أو ضمائر) للأطفال الصغار أن تستشير طبيباً خبيراً مبكراً، وينبغي أن تُعرض على جميع الشباب استشارة الخصوبة وتخزين البويضات أو الحيوانات المنوية قبل أي علاج طبي.
• انتقد التقرير مشروع النزاهة في ييل (ماكنمارا وزملاؤه، 2024) وورقة محكّمة (نون وزملاؤه، 2025). ودافعت عنه مجلة Archives of Disease in Childhood (تشيونغ وزملاؤه، 2025) ومجلة Journal of Sex & Marital Therapy (ماكديفيت وزملاؤه، 2025).

Abstract

1. The aim of this Review is to make recommendations that ensure that children and young people who are questioning their gender identity or experiencing gender dysphoria receive a high standard of care. Care that meets their needs, is safe, holistic and effective. At its heart are vulnerable children and young people and an NHS service unable to cope with the demand. 2. Yet from the start, the Review stepped into an arena where there were strong and widely divergent opinions unsupported by adequate evidence. The surrounding noise and increasingly toxic, ideological and polarised public debate has made the work of the Review significantly harder and does nothing to serve the children and young people who may already be subject to significant minority stress. 3. Within this context the Review set out to understand the reasons for the growth in referrals and the changing epidemiology, and to identify the clinical approach and service model that would best serve this population. 4. There are conflicting views about the clinical approach, with expectation at times being far from usual clinical practice. This has made some clinicians fearful of working with gender-questioning young people, despite their presentation being similar to many children and young people presenting to other NHS services. 5. Although some think the clinical approach should be based on a social justice model, the NHS works in an evidence-based way. Whilst navigating a way through the surrounding ‘culture war’, the Review has been acutely and increasingly aware of the need for evidence to support its thinking and ultimately the final recommendations made in this report. 6. When the Review started, the evidence base, particularly in relation to the use of puberty blockers and masculinising/feminising hormones, had already been shown to be weak. There was, and remains, a lot of misinformation easily accessible online, with opposing sides of the debate pointing to research to justify a position, regardless of the quality of the studies.

Conclusion

The Cass Review concludes that children and young people questioning their gender identity or experiencing gender dysphoria require a high standard of care that is safe, holistic, and evidence-based. The Review found that the evidence base for medical interventions, particularly puberty blockers and masculinising/feminising hormones, is weak, and that clinical practice has been complicated by a toxic, polarised public debate. The ten key recommendations focus on: (1) ensuring services meet standard NHS care standards with clear clinical leadership; (2) implementing holistic assessment frameworks including screening for neurodevelopmental conditions and mental health; (3) using standard evidence-based psychological and psychopharmacological treatments; (4) ensuring early clinical involvement in decisions about social transition of pre-pubertal children; (5-6) establishing robust research and data collection programmes to improve the evidence base; (7) requiring long-standing gender incongruence as essential but not sufficient for medical treatment; (8) exercising extreme caution in prescribing hormones from age 16; (9) requiring national Multi Disciplinary Team review for all medical treatment cases; and (10) offering fertility counselling and preservation before any medical pathway. The Review emphasises that the NHS must work in an evidence-based way rather than following a social justice model, and that the needs of vulnerable children and young people must be prioritised over ideological positions.