If you’ve noticed that only one of your knees is swollen , red, or tender — while the other feels completely normal — it’s natural to feel concerned.
After all, swelling in both knees often points to systemic issues like arthritis or gout. But swelling in just one knee usually means something else is going on — something localized, specific, and potentially treatable.
Let’s explore what could be causing unilateral knee swelling , how serious it might be, and what steps you can take to find relief — or know when it’s time to see a doctor.
What Unilateral Knee Swelling Could Mean
Swelling in just one knee isn’t always cause for panic — but it should never be ignored either.
Unlike general joint stiffness or age-related aches, sudden or persistent swelling in one knee may signal an underlying issue that needs attention.