What it means
Traffic cannibalization is when your own pages compete for the same user intent, so they split rankings and clicks instead of one page winning them. We argue it happens at the user intent level, not the keyword level. That is why Kevin calls it content cannibalization rather than keyword cannibalization. A second, external form is growing: AI search surfaces like Google's AI Overviews (AIOs) cannibalize the clicks that used to reach your site at all.
Why it matters
The biggest misconception about cannibalization is that it happens at the keyword level; it actually happens at the intent level. Cannibalization hurts organic traffic and revenue, and it’s hard to detect because it shifts over time and exists across degrees of overlap. When Google updates its read of intent in a core update, 2 pages that used to coexist can suddenly collide. The external angle matters more each quarter: Google is cannibalizing its own results with AI, which devours the referral traffic you depend on.
Let’s say a DTC skincare brand publishes 2 posts, "best moisturizer for dry skin" and "how to treat dry skin," that serve the same intent. Their cosine similarity is 0.82, so Google keeps swapping which one ranks and neither breaks the top 5. Merging them into one page moves the URL from position 8 to position 3 and doubles its clicks.
How to use this knowledge
Detect overlap at the intent level rather than the keyword level, using content or cosine similarity (above 0.7 is high, below 0.5 is low). Decide the fix by degree of overlap: Consolidate and redirect near-duplicates, or differentiate pages that serve genuinely different intent. Set content governance so new pages do not recreate the problem. Watch the AI side too, tracking impressions against clicks as AIOs absorb queries you used to win.
Growth Memo guidance
The biggest misconception about cannibalization is that it happens on the keyword level. It's actually happening on the user intent level. — Solving keyword cannibalization with AI
Adding an AI chatbot to Search would mean Google would cannibalize itself, which only a few companies in history successfully accomplished. — How to cannibalize your own product well
Product cannibalization, or market cannibalization, is often seen as something bad, but it can be good or even necessary. — Standby as Google cannibalizes itself (while also devouring all of us)
Content cannibalization — Kevin's preferred name, since the overlap is defined by user intent, not keywords.
Cosine similarity — the metric you use to grade how badly 2 pages overlap.
AIOs — the external form of cannibalization, absorbing clicks before they ever reach you.
Core updates — they redraw intent, turning coexisting pages into competitors overnight.