Knee soreness may be caused by gout due to high uric acid, or it may be caused by other reasons such as trauma, strenuous exercise, osteoarthritis, rheumatoid arthritis and so on. 1. Gout: impaired excretion of uric acid, urate deposition in the knee joints, resulting in redness, swelling, pain, burning, limited activity and other symptoms of the knee, some patients manifested as knee soreness. 2. Other causes: soft tissue injury due to trauma, excessive exercise, rheumatoid arthritis, osteoarthritis, spondyloarthritis, etc., may cause knee pain, and need to go to the hospital for examination and clear diagnosis. If there is knee pain, accompanied by swelling, activity limitation and other symptoms, you need to consult a doctor in a timely manner, under the guidance of the doctor for treatment, to avoid aggravation of the condition, resulting in deformation of the knee joint, affecting the normal life.