Synovitis can usually be hot compressed, but special cases can not be hot compressed, the details are as follows: First, most chronic synovitis can be treated by hot compress to improve inflammation, promote joint fluid absorption, reduce joint pain, hot compress treatment can be carried out 6-8 times a day, 30 minutes each time, the temperature control is 40-42 ℃, so the effect is better, generally hot compress need to be carried out continuously for 15-30 days. Second, special synovitis, such as traumatic synovitis, in about three days after the trauma, due to synovial swelling, increased permeability of synovial vessels, will cause acute effusion. If hot compress treatment is used at this time, it will aggravate the formation of effusion and cause the aggravation of synovial inflammation, which is not conducive to the recovery of the disease. Therefore, it is necessary to wait for three days until the inflammation of the joint is gradually relieved, and then use hot compress treatment.