Kidney Cysts: Usually Harmless, Sometimes Not
The difference between simple kidney cysts and those that need watching.
Last updated: 2026-09-24
Simple kidney cysts are common, especially with age, and are usually harmless. More complex or numerous cysts may need follow-up.
When to follow up
Large, complex or multiple cysts — or cysts with symptoms — may need imaging follow-up to distinguish them from polycystic disease or other problems.
Frequently asked questions
Do simple kidney cysts need treatment?
Usually not, unless they cause pain, bleed or block urine flow.