People often get injured by falls due to various reasons in daily life. How  to deal with a fall injury? Is cold or hot compress proper for the injury? Is it  correct to use cold compresses within 24 hours and hot compress after 24 hours  after injury? In fact, the compress method after injury depends on whether it is  acute or chronic. Acute injuries are often caused by sudden traumas (such as  falls, sprains, direct impacts, etc.) and usually cause immediate pain. For  acute injuries, ice compress should be applied as soon as possible, which can  constrict blood vessels, reduce local congestion, lower tissue temperature, and  have the effect of stopping bleeding, reducing swelling and relieving rain. The  specific cold compress method is to put a towel which has been soaked in cold  water on the wound and change it every 3 minutes or so. You can also put ice  cubes in a plastic bag for external compress for 20-30 minutes each time. In  summer, the wound can be washed with tap water for generally 4 to 5 minutes. Is  it necessary to take hot compresses for acute injury after more than 24 hours?  This statement is not accurate. In the first 3 to 5 days of acute injury, as  long as the bleeding is controlled and there is no inflammation in the follow-up  days, cold compresses and hot compresses can be applied alternately. You could  apply a cold compress for 10 minutes, then a hot compress for 10 minutes. The  blood vessels will contract during the cold compress, and dilate after during  the hot compress. A large amount of blood flows into the injured area, which is  beneficial to the repair of damaged tissues. However, it is sometimes difficult  to confirm whether the bleeding is controlled and whether there is inflammation  for non-professionals. Hot compress may aggravate the symptoms. At this stage,  the safest way is to continue the spaced cold compress and observe at any  time.