Shpuld a teenager transition gender identity medical transition?

What the evidence says

This is one of the most debated questions in teen health right now, and different countries have reached different conclusions. There isn't one clear "yes" or "no" answer that all doctors agree on.

In Canada, the Canadian Paediatric Society says gender-affirming hormone therapy can be offered to teens who have a confirmed diagnosis of gender dysphoria, understand the risks and benefits, and are otherwise mentally stable enough to start treatment. They note this approach has been linked to better wellbeing and lower reported suicidal thoughts in some studies, though they also say it carries some health risks that need to be discussed with a doctor. The US Endocrine Society and WPATH (an international group) take a similar approach, generally suggesting hormones can start around age 16, sometimes earlier for individual reasons.

However, the United Kingdom looked at this question very closely through an independent project called the Cass Review, which included a detailed look at all the research. It concluded the evidence was too weak and uncertain to justify using puberty blockers routinely, and puberty blockers are now restricted for under-18s with gender dysphoria in the UK. A recent systematic review done by Canadian researchers at McMaster University reached a similar conclusion: the studies done so far are mostly small, don't compare treated and untreated groups well, and leave real uncertainty about how puberty blockers affect mood, body development, and gender dysphoria itself over time.

Part of the disagreement comes down to the type of evidence available. Almost none of the research is from gold-standard studies where teens are randomly assigned to treatment or no treatment. Most is from following groups of teens who chose treatment and watching what happened, which can't rule out other explanations for improvement.

Because there's no medical emergency and views differ this much, this is a decision best made slowly, with a team that includes a doctor experienced in gender care and a mental health professional, looking at your teen's whole situation rather than following one country's rule alone. Social transition, things like a new name, pronouns, or clothing, is a separate and reversible step from medical transition, and many teens explore that first.