Why Is One Knee Swollen but Not the Other?

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.

For illustrative purpose only

When to See a Doctor

You should seek medical help if:

  • The swelling is sudden, severe, or accompanied by fever
  • The knee is hot, red, or painful to touch
  • You can’t walk or bend the knee
  • Swelling lasts more than a few days without improvement

Final Thoughts

One swollen knee isn’t always a reason to panic, but it’s definitely something to pay attention to. From minor injuries to more serious joint diseases or infections, there are many possible reasons. Getting a proper diagnosis is the first step to effective treatment and long-term knee health.