The '10-Year Rule' a UCLA Doctor Uses to Sort Brain Fog From Dementia

A neurology professor at UCLA has described a "10-year rule" that women can use to help judge whether memory lapses and brain fog are tied to perimenopause or to something more serious, according to a report from Fox News.

What is the 10-year rule?

The rule, as reported by Fox News, is framed as a self-assessment tied to timing. The core idea is that memory or concentration problems that show up in the roughly 10-year window around the menopause transition are more likely linked to shifting estrogen levels than to dementia. Symptoms that appear well outside that window, or that keep getting worse instead of leveling off, are treated as a stronger reason to see a doctor for further evaluation, per the report.

Who came up with the assessment?

Fox News attributes the guidance to a UCLA neurology professor speaking about how clinicians and patients can start to separate two conditions that can look similar day to day: hormone-driven brain fog and early cognitive decline. The report frames the 10-year window as a starting point for a conversation with a doctor, not a stand-alone diagnostic test.

How is perimenopause brain fog different from dementia?

According to the Fox News report, perimenopause-related brain fog tends to track with other symptoms of the menopause transition, such as hot flashes and sleep changes, and it tends to stabilize once hormone levels settle after menopause. Dementia-related memory loss, by contrast, is described as progressive, meaning it keeps getting worse over time rather than holding steady. The report says the distinction matters because the two conditions call for different next steps, one hormonal and often temporary, the other neurological and typically permanent.

What should women do if they notice memory changes?

Fox News reports that women who notice new memory or concentration problems should track when the symptoms started and whether they are getting worse, then bring that timeline to a doctor. The 10-year marker is presented as a rough guide for that conversation rather than a home diagnosis. The report does not list specific tests or medications tied to the rule, and HTT News could not independently verify additional clinical detail beyond what Fox News published.

Where can readers see the full report?

The original account, including the doctor's full remarks, is available from Fox News. Fox News is the only outlet HTT News found publishing this specific account as of Sept. 26, 2026, and this report is limited to what that story states.

The numbers so far

• 10 years: the window Fox News reports as the rough marker separating hormone-linked brain fog from a pattern that may need dementia screening.
• 2 conditions commonly confused in this age group, per the report: perimenopause-related cognitive changes and early-stage dementia.

Artiglio is A coming-soon iPhone chief of staff for briefings and drafts. Not on the App Store yet.