Joint swelling, redness, stiffness, and warmth
Joint swelling, redness, stiffness, and warmth are signs of inflammation.
Inflammation occurs when the tissues of the knee (cartilage, meniscus, ligaments, and synovial membrane) are injured, infected, or triggered by a disease, leading to an increase in the inflammatory substance and blood flow around an affected joint.
Diseases or conditions which cause the symptoms
- Knee osteoarthritis
- Cartilage or meniscus injury
- Rheumatoid arthritis
When to see a doctor
- Severe inflammatory pain when physically active or inactive
- Unable to fully stretch and bend the knee or bowlegs
- Severe pain with a pricking, burning, tingling, or numbing sensation
- Joint swelling, redness, stiffness, warmth, and fever