Knee fever and pain may be caused by knee inflammation, knee infectious disease, osteoarthritis, meniscus injury, etc., and you should consult a doctor in time to find out the cause of the disease. 1. Knee joint inflammation: for example, rheumatoid knee arthritis, the acute attack will be manifested as redness, swelling, heat and pain in the knee joint, and even knee joint pain and swelling. 2. Infectious diseases of the knee: for example, septic arthritis, which also manifests as fever, redness, swelling and pain in the knee. 3. Osteoarthritis, meniscus injury: triggering chronic inflammation of the knee joint, leading to the emergence of knee joint neuralgia, which will also show the symptoms. Knee fever and pain may also be caused by other factors, it is recommended to consult a doctor in time to clarify the cause of the disease and give targeted treatment.