After the sprain is not always can not rub, need to be divided into specific time period. Because in the first 24 hours of injury, soft tissue damage is more obvious, inside the capillary rupture, there will be obvious bleeding caused by swelling. At this time to still rub the action, will aggravate the blood vessels inside the bleeding, thus causing swelling and pain. However, after this period of time, bruises are formed inside, and it is necessary to promote the reduction of bruises, swelling and pain by activating blood circulation and removing blood stasis to relieve pain. At this time, you can rub lightly. Violent methods should not be used at this time, because the tissue has already been damaged, and the damage will still be further aggravated if there is still violent kneading. Instead, there is no obvious violence in the slightest rubbing, just a certain amount of heat generated by the process. It has a certain effect of activating blood circulation and removing blood stasis, relieving pain, and helping the swelling and pain to subside.