The time for icing trauma must be decided according to the seriousness of the specific trauma, if it is an ordinary soft tissue contusion or a mild local ligament strain, this situation is generally iced for 3-5 hours on. But if there is a serious soft tissue contusion, abnormal swelling of the limb, or even fracture, the ice time can be relatively extended, generally intermittent dressing 24 hours are no problem. If the weather is hot, it can also be applied for 48 hours. But not continuous ice, usually ice for about half an hour, and then rest for half an hour, and then do the second ice, so that you can avoid long-term skin stimulation by the cold and frostbite.