Coarse salt hot compresses on the treatment of knee synovitis is able to play a supplementary therapeutic effect. First of all, if you are a young person who used to do a lot of exercise, you should reduce the amount of exercise, so that the knee joint can fully rest, and reduce the activities that aggravate the burden on the joint. If there is no significant activity, the knee should be examined for structural damage and an MRI should be taken to obtain an accurate diagnosis. By treating the structural damage, synovitis can be well treated. Secondly, synovitis in the elderly often occurs in conjunction with osteoarthritis or rheumatoid arthritis. Arthritis is the underlying cause of synovitis, so treatment of arthritis is a priority. Commonly used methods for treating arthritis include functional exercises for the quadriceps muscles of the knee joint, avoiding movements such as stair climbing, mountain climbing, squatting, etc., oral anti-inflammatory and analgesic medications, topical anti-inflammatory and analgesic ointment, or intra-articular injections of sodium vitreous acid and cotrimoxazole injection for joint treatment. Of course both cases can use coarse salt hot compresses to relieve the symptoms, is a good auxiliary treatment.