keyword cannibalization
Also called: keyword cannibalisation, content cannibalization, keyword cannibalism, cannibalization
Keyword cannibalization is when two or more pages on the same site compete for the same query, so ranking signals that should concentrate on one page get split across several. The usual result is weaker, fluctuating rankings than a single focused page would earn.
The mechanic is signal-splitting. Google usually picks one URL per query to show, so if a blog post, a category page, and a product page all target “running shoes,” your backlinks, internal links, and engagement data scatter across three URLs instead of stacking on one strong page. You often see it as two of your own URLs swapping places week to week, or a weaker page outranking the one you meant to push.
When it is not actually a problem
The term gets overused. Google’s John Mueller has pushed back on it, saying that three of your pages showing for one query “doesn’t seem problematic to me just because it’s ‘more than 1’.” What matters is intent. A how-to guide, a comparison, and a product page can all rank for related queries because each answers a different need. Real trouble starts only when two pages chase the identical intent and one clearly drags the other down.
To check, run site:yoursite.com "your topic" or look at which URL Search Console reports for a query over time. The usual fix is consolidation: merge the weaker page into the stronger one and add a 301 redirect, which pulls the links and signals onto a single URL. Reserve rel=canonical for genuine duplicates, not for two pages that serve different searchers.
How it affects your traffic
Cannibalization is quiet. Nothing errors and nothing falls off a cliff, so you leave rankings on the table while your own pages dilute each other. A page that should sit at position 3 stalls at 8 because half its authority lives on a near-duplicate you forgot about. Catching it means mapping every URL to its target query and reading the SERP history, which is exactly what an SEO Audit does before recommending merges, redirects, or a keyword remap. Fix the overlap and you often recover positions without publishing a single new page.
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