What is Topic cluster?
A topic cluster is a group of pages built around one subject: a central pillar page, such as a complete guide to knee replacement, linked to and from supporting pages that each answer a narrower question, such as recovery time, cost or robotic surgery. The structure shows search engines and AI assistants that the hospital covers the subject in depth.
Why it matters for hospitals
Patients research treatments over weeks, asking many related questions. A cluster lets a hospital answer each question once, well, and guide readers towards a consultation. It also prevents the scattered, overlapping blog posts that compete with each other.
How to put it into practice
- Pick clusters around high-value service lines, not random blog ideas.
- Build the pillar as the main treatment or specialty page, and list the patient questions it cannot fully cover.
- Write one supporting page per distinct question, reviewed by the relevant specialist.
- Link every supporting page back to the pillar and to the right doctors.
- Refresh the cluster as a set, not page by page.
The common mistake
Writing ten near-identical posts on the same question and calling it a cluster, which creates cannibalisation rather than depth.
An illustrative example
An oncology centre built a breast cancer cluster with a pillar page and supporting pages on screening, diagnosis, treatment options, costs and second opinions. Enquiries began naming specific pages, showing patients read several before calling. (Composite example, not a specific hospital.)
Related terms
Further reading
Part of the healthcare growth and digital glossary. Last reviewed 7 October 2026.