5. Osteoarthritis (Localized)
Though osteoarthritis typically affects both knees over time, it can start in just one knee, especially if that knee has experienced past injuries or bears more weight. Swelling may be mild to moderate and worsen with activity.
6. Baker’s Cyst
A Baker’s cyst is a fluid-filled swelling that develops at the back of the knee. It’s often caused by conditions like arthritis or a cartilage tear and may make one knee feel tight or swollen—especially when bending or straightening the leg.
7. Bl00d Clot or Circulation Issue
Though rare, a blood clot (deep vein thrombosis) in the leg can cause swelling in the knee area, especially if combined with calf swelling, warmth, or pain. It’s a medical emergency and needs immediate attention.
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