Can ice reduce swelling?

Ice can make blood vessels contract, for acute trauma such as sprain, fall caused by swelling can play a detumescence effect, but need to be injured within 24 hours after the ice, if more than 24 hours, then ice has no obvious detumescence effect. And in the ice need to pay attention, can not directly contact the skin, can use dry towel in the local wrap, so that ice indirect contact with the skin. If the swelling exceeds 24 hours, you can consider choosing hot compress and other methods, which will also help with local swelling. However, if the edema caused by varicose veins, heart and lung diseases, you cannot go through ice detumescence, and you need symptomatic treatment according to the diagnosis.