The most common site of synovitis in children is the hip joint, followed by the knee joint. Synovitis in a weight-bearing joint can have the following clinical symptoms: First, joint pain, which occurs as a result of an inflammatory response to synovitis. The pain is more pronounced when walking, straining, or getting cold, and may decrease after rest. Second, swelling. Patients with synovitis have reactive inflammatory exudate, and there is fluid in the joint cavity, resulting in joint swelling. Third, joint movement is limited. When the joint is painful and swollen, joint movement is significantly limited. Fourth, reactive fever may occur. Very few patients may have a reactive low-grade fever, which usually subsides after oral medication is administered. Children with synovitis should rest and avoid strenuous activities, and exercise the muscles around the joints to promote healing of synovitis.