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Irrefutable — therefore not science

Q: Is everything that isn't falsifiable nonsense?

No. Mathematics, logic and ethics are not falsifiable either — and no one calls them nonsense. But as soon as you make a statement about the real world (such as "there is an inner gender"), it must in principle be testable. Gender identity is sold as fact but, according to critics, behaves like belief.

Q: Does Popper still apply?

Popper's criterion has been criticised and adjusted in the philosophy of science. The core idea, that an empirical claim must in principle be testable, remains a widely used starting point. Whether gender identity meets it is precisely what the critics and their opponents disagree about.

Q: What if someone says their 'feeling' is the evidence?

Feeling is not evidence for a statement about the outside world. Someone with anorexia can feel fat while being underweight — no one concludes from that that she really is fat. The same applies to "I feel like a woman" as evidence that someone is a woman. See being versus feeling.

"Unfalsifiable" is jargon. It simply means: a statement that can never be disproven. If no measurement, no test and no observation can contradict a claim, then that claim is not science but belief. That is precisely the problem with "gender identity".

A simple example

Suppose I claim that an invisible, odourless, intangible dragon lives in my garage. You can never find evidence for it — but also never evidence against it. Does that sound like a statement about reality? Yet it is not, because no test can disprove it.

The same reasoning applies to "I have an inner feminine essence". No scan, no measurement and no behavioural observation can refute that claim. It is therefore not a scientific statement, however emphatically it is made.

What did Popper say?

The philosopher Karl Popper (Logik der Forschung, 1935) set it out as a criterion: a statement is only science if at least one conceivable observation can refute it (source). "All swans are white" is science — because one black swan breaks the statement. "There is an inner gender" is, by this reasoning, not science, because what finding would disprove it?

How does that work with gender identity?

Someone with XY chromosomes claims a female "inner identity". What could refute that claim? According to critics: nothing. The claim thereby slides into metaphysics or faith — and connects with the circular reasoning on which, according to this criticism, the whole edifice rests: "I feel it, so it is so, and so it exists".

Comparison with pseudoscience

Popper counted astrology among the pseudosciences and psychoanalysis among the pre-sciences (source). According to critics, gender identity shares a property with such theories: if someone presents as feminine, that confirms "the identity"; if someone presents as masculine, that is called "a masculine expression of a female identity". Theories that explain everything in fact explain nothing. See also self-report as a source.

The emergency bandage: ad-hoc repairs

When research yields no reliable brain marker, no genetic marker and no measurable marker, the theory, according to critics, is not discarded but stretched: there are now "many gender identities" without a common basis.

Why this matters

Irrefutability is no academic game when policy is built on it. The Cass Review (2024) calls care for young people with gender dysphoria "an area of remarkably weak evidence" (source). Dhejne et al. (2011), a Swedish register study of 324 adults who underwent sex reassignment surgery between 1973 and 2003, found an adjusted hazard ratio of 19.1 for death by suicide compared with controls; the authors conclude that sex reassignment may alleviate dysphoria but may not suffice as treatment (source). The study did not concern minors. See also gender-critical researchers.

Is everything that isn't falsifiable nonsense?

Does Popper still apply?

What if someone says their 'feeling' is the evidence?

Sources

Popper K. (1935/1959/2002). The Logic of Scientific Discovery . Routledge. Stanford Encyclopedia
Hruz P.W. (2020). Deficiencies in scientific evidence for medical management of gender dysphoria. Linacre Quarterly , 87(1). Europe PMC
Levine S.B. (2021). Reflections on the clinician's role with individuals who self-identify as transgender. Archives of Sexual Behavior . Europe PMC
Dhejne C. et al. (2011). Long-term follow-up of transsexual persons undergoing sex reassignment surgery. PLoS ONE . Europe PMC
Cass H. (2024). Independent Review. NHS England. PDF