Knee joint swelling if osteoarthritis or synovitis can be soaked in warm boiled water, if it is the acute stage of trauma, gout or infection can not be soaked in warm boiled water. Knee joint swelling may be related to synovitis, osteoarthritis, if the swelling and pain is obvious can be warm boiled water soak, can improve local blood circulation, is conducive to swelling and pain, each time you can soak for 20 to 30 minutes. For the acute phase of trauma caused by knee swelling, especially within 72 hours of injury, local bleeding and oozing, if the warm water soak may cause further aggravation of swelling, it is recommended to avoid warm water soak. Gout or joint infection caused by joint swelling is even more can not warm water soak, because it will cause the spread of inflammation, pain aggravation. Therefore, if the knee joint swelling can be warm water soak, must first consult the doctor to find out the cause of the disease.