This is actually more common than you'd think right now — especially after Google's recent updates in 2025.
Here are the most likely reasons your blog content got deindexed:
1. Low or Zero Engagement If your blog posts had little to no clicks or impressions over time, Google sees them as pages that aren't useful to anyone. Google has been aggressively purging these kinds of pages from its index lately.
2. Thin or Shallow Content It's not just about word count. If your posts don't go deep enough on a topic — no real insight, no unique perspective, just surface-level stuff — Google will eventually drop them. Even good internal linking won't save a weak post anymore.
3. AI-Generated Content Without Human Touch If your content was mostly AI-written without proper editing, adding real expertise, or author credentials, Google's recent core updates have been specifically targeting this.
4. Accidental Noindex Tag Check your site for <meta name="robots" content="noindex"> tags. Sometimes a CMS plugin or a developer accidentally applies this sitewide instead of on specific pages.
5. Robots.txt Blocking Go to your robots.txt file and make sure /blog/ isn't being blocked from Googlebot.