Rumer Willis, 37, in a recent interview has spoken about the emotional weight of getting genetically tested after her father, action star Bruce Willis, was diagnosed with frontotemporal dementia. She called the process “terrifying” — and one of the more empowering things she’s done for her own health.
When a parent is diagnosed with a progressive neurological disorder, the whole family ends up recalibrating around it. For Rumer Willis, watching her father live with frontotemporal dementia since 2023 pushed her to think seriously not just about his condition, but about her own genetic risk — and eventually, to get tested for it herself.
Advertisement
Bruce Willis’s Health Journey and the Reality of Frontotemporal Dementia
Questions about how Bruce Willis is doing have followed the actor since his family first announced he was stepping back from acting, a decision that came before his 2023 diagnosis of frontotemporal dementia (FTD) was made public.
At 71, Willis is now surrounded by a close-knit family — wife Emma Heming Willis, former spouse Demi Moore, and his daughters who have repeatedly used their public platform to talk honestly about what this progressive, irreversible illness actually looks like day to day.
Advertisement
What Is Dementia, and How Is It Diagnosed?
Dementia isn’t one disease — it’s an umbrella term for a group of symptoms caused by ongoing damage to brain cells. Alzheimer’s is the form most people have heard of, but Bruce Willis’s diagnosis is frontotemporal dementia, which behaves quite differently.
Rather than starting with memory loss, FTD attacks the frontal and temporal lobes first — the parts of the brain responsible for personality, emotional regulation, decision-making, and language.
What Is Frontotemporal Dementia?
Because of where it affects the brain, FTD often shows up first as changes in personality, judgment, or behaviour, and — frequently as aphasia, a breakdown in the ability to produce or understand language. Rumer has said this was part of why her father had to leave acting: the aphasia made it difficult for him to continue working.
Genetically, FTD is unusual among dementias. Somewhere between 10% and 20% of cases follow a clear autosomal dominant pattern, meaning a single mutated copy of a gene is inherited from just one parent is enough to cause the disease. The three genes most commonly implicated are:
Advertisement
How Is Dementia Actually Diagnosed?
There’s rarely a single test that confirms dementia. Instead, doctors typically piece the diagnosis together from several angles:(1✔ ✔Trusted Source
Focus On Frontotemporal Dementia (FTD)
)
- A detailed medical and cognitive history, mapped against standardized memory, language, and problem-solving assessments
- Brain imaging such as an MRI or CT scan to look for patterns of tissue loss or rule out strokes and tumours
- Bloodwork to eliminate reversible causes of cognitive decline, like thyroid problems or a severe vitamin deficiency.
Rumer Willis on Motherhood, Career, and Choosing to Know
Rumer has built a career across film and television, but it was becoming a mother to her daughter, Louetta that seems to have sharpened her focus on her own long-term health. She’s described the shift less as fear of a specific disease and more as a general move toward tracking her cognitive and metabolic health proactively, rather than waiting and wondering.
What Genetic Testing for Dementia Actually Involves
Genetic testing for dementia isn’t one uniform thing — the type of test, and what it can tell you, depends heavily on the situation.
- Diagnostic testing is used on someone who already has symptoms, to confirm whether a known gene mutation is the cause.
- Predictive testing is offered to family members who don’t yet have symptoms, when a relative’s dementia has already been traced to a specific inherited mutation — it tells them whether they carry the same altered gene.
According to the Alzheimer’s Society, diagnostic testing is usually only recommended when someone has developed symptoms unusually early — in their 30s or 40s, for instance — or when there’s a distinctive pattern running through the family. If a doctor doesn’t find a strong family history, they generally won’t recommend the test at all.(2✔ ✔Trusted Source
Genetic testing for dementia
)
There’s also an important difference between risk genes and deterministic genes.
A variant like APOE-e4 raises the statistical odds of developing dementia later in life, but it’s far from a guarantee — plenty of people carrying it never develop the disease, and plenty without it do.
Deterministic mutations, on the other hand — specific changes in GRN, MAPT, or C9orf72 behave very differently: if you inherit one from an affected parent, you will almost certainly develop the disease. It’s a genuinely different category of information, and one reason predictive testing is never handled casually.
The Alzheimer’s Society is explicit that predictive testing is only offered alongside genetic counselling, both before and after — and notes that a meaningful number of people go through counselling and then decide not to take the test at all. That’s not considered a failure of the process; it’s treated as a legitimate outcome.
For those who do test positive, there’s also a family-planning option worth knowing about: pre-implantation genetic testing (PGT), used during IVF to screen embryos for the specific mutation before implantation, which is available through the NHS for families affected by familial Alzheimer’s or familial FTD who meet certain criteria.
A Word of Caution on At-Home Genetic Tests
Not every genetic test is created equal. Direct-to-consumer kits — the mail-in saliva tests sold online — are not recommended by the Alzheimer’s Society, and for fairly practical reasons: they’re less reliable than accredited lab testing, they typically come with no input from a doctor or genetic counsellor to help interpret what the results actually mean, and UK doctors are advised to disregard them entirely when deciding whether to refer someone for proper genetic testing.
What This Means for Families Facing Dementia
Knowing your genetic status doesn’t change your biology — but it can change how you plan around it. Managing cardiovascular health, staying metabolically stable, exercising regularly, and building cognitive reserve are all associated with greater brain resilience and, in some cases, a delayed onset of symptoms.
By speaking candidly about how frightening this process felt, Rumer Willis has put words to something a lot of families quietly go through without ever discussing it publicly. It doesn’t make the underlying disease any less difficult. But it does suggest something worth holding onto: having clear information, even when it’s hard to hear, is what allows families to actually plan — rather than simply wait.
References:
- Focus On Frontotemporal Dementia (FTD)- (https://www.ninds.nih.gov/current-research/focus-disorders/alzheimers-disease-and-related-dementias/focus-frontotemporal-dementia-ftd)
- Genetic testing for dementia- (https://www.alzheimers.org.uk/about-dementia/genetic-testing-dementia)
Source-Medindia