The location and severity of knee pain may vary, depending on the cause of the problem. Signs and symptoms that sometimes accompany knee pain include:

  • Swelling and stiffness
  • Redness and warmth to the touch
  • Weakness or instability
  • Popping or crunching noises
  • Inability to fully straighten the knee

When to see a doctor

Call your doctor if you:

  • Can't bear weight on your knee
  • Have marked knee swelling
  • Are unable to fully extend or flex your knee
  • See an obvious deformity in your leg or knee
  • Have a fever, in addition to redness, pain and swelling in your knee
  • Feel as if your knee is unstable or your knee "gives out"
Mar. 29, 2013