Synovitis is most prevalent in children between the ages of 3 and 6 years old, mainly in the knee joint, and is characterized by a rapid onset of the disease. Synovitis can be triggered by two conditions: trauma, such as impact and friction, and the accumulation of inflammation in the body caused by the flu. Synovitis requires some time to recover and will not heal on its own, but requires treatment. Synovitis is mainly characterized by joint effusion, swelling, redness, pain, joint deformation, and muscle atrophy. You can eliminate the fluid and restore the function of the joint by massage and external application as soon as possible, and you should reduce your activities and try to rest in bed. Because there are many synovial tissues in the joints, even surgical treatment cannot remove all the diseased tissues, and if the regenerated synovial membrane becomes heterogeneous, new synovitis symptoms will occur; synovitis cannot be cured because the tendency of synovitis is fluctuating and gradually worsens in fluctuation; however, there are special cases, and this special synovitis is a child’s body because of However, there are special cases in which this particular type of synovitis is a transient form of synovitis that occurs in children due to physical development, which has a rapid onset and fades quickly and does not usually occur twice.