SEO Issues
SEO issues are technical, content, or site-structure problems that prevent search engines from crawling, indexing, rendering, or ranking pages correctly.
Start here
- Start with Google Search Console to spot crawl and index issues.
- Don't use robots.txt to deindex pages—use noindex or password protection.
- Check for leftover noindex tags after any site launch or migration.
- Fix broken links and orphan pages to improve crawl efficiency.
- Address Core Web Vitals early—they're ranking signals, not afterthoughts.
I've tripped over most of these myself, so I'll save you the same headaches.
What I'd do first
- Check Google Search Console for crawl errors, index coverage, and manual actions. This is your free triage tool.
- Review robots.txt to ensure you're not accidentally blocking important pages. Use the tester in Search Console.
- Scan for noindex tags on pages you want indexed. A leftover noindex from staging can kill a page's visibility.
- Fix broken links and 404s—they waste crawl budget and frustrate users.
- Test page speed with PageSpeed Insights and address Core Web Vitals issues.
Plain-English take
SEO issues are anything that stops Google from finding, reading, or trusting your pages. They fall into three buckets:
- Technical: server errors, robots.txt blocks, noindex tags, slow load times, mobile-unfriendly design.
- Content: duplicate content, thin pages, missing structured data.
- Structure: broken internal links, orphan pages (no links pointing to them), bad URL hierarchy.
If Google can't crawl your page, it can't index it. If it can't index it, it can't rank it. Fixing these issues is like clearing a path before you start planting flags.
When it actually matters
- After a site migration (domain change, CMS switch, redesign) — broken redirects and lost pages are common.
- When traffic drops suddenly — a new noindex tag or robots.txt block could be the culprit.
- Before launching new content — ensure the technical foundation is solid so your effort isn't wasted.
- Monthly as maintenance — crawl errors and speed issues can creep in with updates or third-party scripts.
What I got wrong
- Blocking pages with robots.txt when I meant to deindex them. Robots.txt stops crawling but doesn't remove pages from the index. Use
noindexor password protection instead. - Leaving noindex tags on after a staging-to-production launch. I once had a client's homepage hidden for weeks because of this.
- Relying on canonical tags alone for duplicate URLs. A 301 redirect is often the cleaner fix—canonicals are hints, not commands.
- Ignoring orphan pages. I assumed all pages were linked from somewhere, but a site audit revealed dozens of unlinked product pages that Google never found.
Next step
Quick answers
What are SEO issues?
SEO issues are problems with a website's technical setup, content, or structure that prevent search engines from crawling, indexing, or ranking pages effectively.
How do I find SEO issues on my website?
Use Google Search Console to check for crawl errors, index coverage, and manual actions. Run a site audit with tools like Screaming Frog, Ahrefs, or Semrush to identify technical problems.
What is the most common SEO issue?
Common issues include blocked pages via robots.txt, missing or incorrect noindex tags, duplicate content, broken links, and slow page speed.
Sources
Primary documentation is linked directly. Anything commercial is marked nofollow.
- Google Search Central — Primary source for Google's guidance on crawling, indexing, robots directives, sitemaps, canonicalization, and structured data.
- Google Search Central - SEO Starter Guide — Good foundation for technical SEO basics and how Google recommends making sites search-friendly.
- Google Search Central - Robots.txt Introduction — Authoritative explanation of how robots.txt affects crawling and what it cannot control.
- Google Search Central - Sitemaps — Explains the role and limits of XML sitemaps in discovery and indexing.
- Google Search Central - Canonicalization — Authoritative guidance on duplicate URLs and canonical signals.
Notes from Callum Bennett.