YMYL Topics and Algorithm Updates: Why Some Niches Swing Harder

Look at almost any chart of ranking volatility during a Google core update and you'll notice that some industries move far more than others. Health, finance and legal sites often see the biggest swings, both up and down. That isn't a coincidence, and it isn't because Google is targeting those industries. It comes down to a category Google calls YMYL: "Your Money or Your Life".

YMYL topics are those where poor information could seriously harm people. Google treats them with higher quality standards, both in its guidance to human quality raters and in the way it describes its ranking systems. When Google improves how it measures reliability, the effects tend to show up first and hardest on YMYL queries.

In this guide you'll learn what YMYL means according to Google's own documents, why systems that prioritise reliable information weigh it heavily, what past updates such as the 2018 "Medic" update showed, and how YMYL sites can build resilience in 2026.

Key Takeaways

• YMYL covers topics that could significantly affect people's health, financial stability or safety, or the welfare of society.
• Google says it gives extra weight to content with strong E-E-A-T on YMYL topics, and raters apply very high Page Quality standards to them.
• Google's reliable information systems are designed to surface authoritative pages and demote low-quality content, which naturally matters more where accuracy is critical.
• The August 2018 core update was nicknamed 'Medic' by the industry because health and wellness sites appeared to be hit particularly hard. Google did not use that name.
• Resilience comes from accuracy, qualified authorship, transparent ownership and regular review, not from chasing individual updates.

What YMYL means

Google's overview of the Search Quality Rater Guidelines describes YMYL topics as those that “could significantly impact the health, financial stability, or safety of people”, or the welfare or well-being of society. Because the stakes are higher, raters are told to apply very high Page Quality standards to these pages.

The same idea appears in Google's public guidance on creating helpful, reliable, people-first content, which says Google's systems give extra weight to content with strong E-E-A-T for these topics. In September 2025, Google updated the rater guidelines again, and Search Engine Land reported that the change log included updated YMYL definitions alongside new examples, including AI Overviews examples.

YMYL area	Example topics	Why the bar is higher
Health and safety	Symptoms, medications, mental health, emergency advice	Wrong information can cause physical harm
Financial stability	Investing, taxes, loans, insurance, retirement	Errors can cause serious financial loss
Society	Civic information, news on major events, groups of people	Misinformation can affect many people at once
Other high-stakes decisions	Legal rights, housing, major purchases	Poor advice can have lasting consequences

Plenty of pages touch on these subjects without being high-stakes. A recipe that mentions protein isn't a medical page. YMYL is a sliding scale, and the more harm inaccurate content could cause, the higher the expectations.

Why reliable information systems weigh YMYL heavily

Google's ranking systems guide lists "reliable information systems" among its active systems. It describes multiple systems working “in various ways to show the most reliable information possible”, including surfacing authoritative pages, demoting low-quality content and showing content advisories when reliable information is lacking. Our post on reliable information systems breaks these down.

Put those pieces together and the volatility pattern makes sense:

• Higher weighting. When Google refines how it measures reliability and trust, queries where those signals carry the most weight move the most.
• Stronger competition. YMYL results often include hospitals, government bodies, banks and major publishers with long-established authority.
• Less tolerance for thin content. Generic, unreviewed articles that might survive in a hobby niche are more likely to lose ground on a health or money query.
• Broad updates show up here first. Core updates change how quality is assessed overall, so the categories where quality matters most act like an early-warning signal.

A quick reminder from Google about raters: they help evaluate whether systems work, but they do not decide rankings.

“Search raters have no control over how pages rank.”

— Google Search Central, Creating helpful, reliable, people-first content

Patterns in YMYL volatility

Google rarely says which industries an update affected, so most of what we know comes from industry tracking. Treat the following as observed patterns rather than confirmed targeting.

Update	What Google confirmed	What the industry observed
August 2018 core update ('Medic')	A broad core update, confirmed on 1 August 2018	Click Intelligence's history notes it appeared to impact the health and wellness sector in particular; the nickname stuck
March 2019 core update	The first update named with Google's month-year convention	Search Engine Land reported survey feedback showed no obvious patterns in the types of sites affected
September 2019 core update	Announced shortly before launch on 24 September 2019	Search Engine Land's 2019 review notes the update appeared to have a larger effect on YMYL sites, though overall impact was smaller than June 2019
Later core updates (2020–2026)	Broad updates; Google doesn't name affected sectors	Health and finance remain among the categories trackers routinely flag as volatile

Two lessons come through. First, "Medic" was an industry label. Google described it as a broad core update, not a health update. Our full write-up of the August 2018 Medic update covers what is and isn't known. Second, YMYL volatility runs in both directions. Sites that invested in accuracy and expertise have often gained as others fell.

Building a resilient YMYL site

There is no special YMYL fix. There is, however, a dependable process for raising the quality bar. Work through these steps:

1. Map your YMYL pages. List every page that gives health, financial, legal or safety guidance, and rank them by traffic and potential for harm.
2. Assign qualified authors or reviewers. Match each topic with someone whose qualifications or experience fit, and show that clearly on the page.
3. Source every important claim. Link to primary sources such as government agencies, regulators, peer-reviewed research and official guidance.
4. Set a review schedule. Rates, rules and medical guidance change. Show the last reviewed date and keep it honest.
5. Be transparent about who you are. Ownership, contact details, editorial policies and any commercial relationships should be easy to find.
6. Remove or merge weak pages. Thin articles written only to capture keywords drag down trust in the rest of the site.
7. Monitor by section. Track YMYL folders separately in Search Console so you spot changes quickly.

Healthcare providers have an extra layer of responsibility. In the US, patient testimonials, case studies and before-and-after content must respect HIPAA rules on protected health information, which generally means getting a patient's written authorisation before publishing identifiable details. Keep marketing content factual and avoid promising outcomes. Our SEO for doctors service is built around these constraints.

For sector-specific advice, see our guides to algorithm updates for health sites and algorithm updates for finance sites. If you've already been hit, our YMYL core update recovery guide walks through the diagnosis.

Common mistakes

• Assuming you're not YMYL. Many business sites publish money or health advice on their blog without realising the standard that applies.
• Credential theatre. Listing a reviewer who never actually reviewed the page undermines trust if readers or journalists check.
• Stale information. Out-of-date rates, dosages or regulations are a fast way to fail on accuracy.
• Making strong claims without evidence. Health and financial promises need sourcing, and many are restricted by advertising and professional rules.
• Reacting to every tremor. YMYL rankings move often. Look for sustained changes before rewriting large sections of a site.

Related Guides

• Search Quality Rater Guidelines and Algorithm Updates
• Where Page Experience Stands as a Ranking Signal Today
• Site-Wide vs Page-Level Signals in Google Updates

Frequently Asked Questions

What does YMYL stand for?

'Your Money or Your Life'. Google uses it for topics that could significantly affect people's health, financial stability or safety, or the welfare of society.

Is YMYL a ranking factor?

Not as a switch. Google says its systems give extra weight to content with strong E-E-A-T on YMYL topics, and raters apply higher quality standards to them.

Was the Medic update a health-only update?

No. 'Medic' was an industry nickname for the August 2018 broad core update. Health and wellness sites appeared to be hit particularly hard, but Google described it as a broad core update.

Why do finance and health sites swing so much during core updates?

Because reliability carries more weight on those queries, competition includes highly authoritative sources, and broad changes to how quality is assessed show up most where quality matters most.

Do I need a medical or financial expert to write my content?

Not always as the writer, but YMYL content benefits from qualified authors or reviewers, clear sourcing and regular review, all shown transparently on the page.

Conclusion

YMYL sites live under a higher standard, which means more volatility but also more reward for doing the work properly. Focus on accuracy, qualified input and transparency, and keep your monitoring calm and section-based. For broader context, read our hub on Google core updates. If your YMYL site needs a quality review, request a free quote from our team.

References

1. Search Quality Rater Guidelines: An Overview (Google PDF)
2. Creating helpful, reliable, people-first content — Google Search Central
3. A guide to Google Search ranking systems — Google Search Central
4. Google updates search quality raters guidelines adding AI Overview examples & YMYL definitions — Search Engine Land
5. Complete Google algorithm update history — Click Intelligence
6. The big list of 2019 Google Search algorithm updates — Search Engine Land
7. What Is YMYL & How Does It Affect SEO? — Semrush Blog