High uric acid and knee swelling may be caused by infection, synovitis, gouty arthritis and so on. 1. Infection: if the patient suffered trauma, open knee injury, resulting in bacterial infection, resulting in high uric acid and knee swelling, local redness, pain and other symptoms. 2. Synovitis: If the patient is affected by excessive joint movement, joint injury, cartilage degeneration or osteophytes, it will cause high uric acid and knee swelling, accompanied by pain, resulting in limited knee activities. 3. Gouty arthritis: when affected by genetic and environmental factors, resulting in patients with elevated uric acid and knee swelling. It is recommended that patients go to the hospital in a timely manner, under the diagnosis of the doctor, according to the specific performance of the disease, follow the doctor’s instructions to take targeted treatment, to maintain a proper lifestyle and diet, and actively cooperate with the treatment.