Why Is One Knee Swollen but Not the Other?
Noticing that only one knee is swollen can be alarming—especially when the other knee feels perfectly fine. While swelling in both knees often points to systemic issues like arthritis, swelling in just one knee usually indicates a localized problem. Understanding the potential causes behind unilateral knee swelling can help you decide whether it’s something minor or a sign you need medical attention.
1. Injury or Trauma

The most common reason for swelling in just one knee is trauma or overuse. You may not even remember the specific moment of injury—especially if it was a repetitive motion injury. Some possible issues include:
- Ligament sprain or tear (ACL, MCL)
- Meniscus tear
- Patellar dislocation
- Fracture or bone bruise
In these cases, swelling often appears within hours and may be accompanied by pain, stiffness, or a feeling of instability in the joint.
2. Bursitis
CONTINUE READING ON THE NEXT PAGE 🥰💕
How to Build a Homemade Egg Incubator Using a Water Bottle
Creamed Chipped Beef on Toast
Remarkable Progress! Hair Growth on Bald Spots Occurring Faster Than Anticipated!
Hate Toilet Issues? Here Are 10 Hacks to Help You Save Hundreds
Drink Lemon Water Instead Of Pills If You Have One Of These 13 Problems
Throwing Away Silica Gel Packets? You’re Wasting Money!
She plays dead on the road – when I understand why my heart is filled with warmth
Soap water is a gardener’s defense. Here’s why
20 DIY cleaning hacks for a spotless home