Muscle pain above the knee, consider excessive exercise, muscle inflammation, bursitis, lumbar intervertebral disc herniation and other causes. 1. Excessive exercise: excessive activity of the knee joint will lead to a large accumulation of lactic acid under the quadriceps muscle, due to the activity of the muscle congestion and swelling, affecting the local blood circulation, muscle soreness and discomfort above the knee. 2. Muscle inflammation: long-term physical labor, or excessive lower limb activity, causing local muscle aseptic inflammation, resulting in strain pain. 3. Bursitis: Acute knee osteoarthritis may lead to bursitis above the knee, causing localized soreness and pain, and there may be fluctuating sensation when pressed. 4. Lumbar disc herniation: Lumbar disc herniation (lumbar 3-4) stimulates or presses the lumbar nerves, resulting in soreness and discomfort in the muscles above the knee in the area it innervates. It is recommended to consult a physician for treatment of muscle pain above the knee.