Ice or Heat for an Injury? When to Use Each and for How Long
Published by UnityMedicalSupplies on Nov 4th 2026
Published November 2026
Use ice first, heat later. For a fresh sprain, strain or bump, Cleveland Clinic advises ice for 10 to 20 minutes at a time, every 1 to 2 hours, for the first 24 to 48 hours. After about 48 hours, heat is okay, also for 10 to 20 minutes at a time (Cleveland Clinic). Don't overdo either one, and see a doctor if the injury isn't getting better.
Ice vs heat at a glance
| Ice (cold) | Heat | |
|---|---|---|
| When | The first 24 to 48 hours after an injury | After about 48 hours |
| How long | 10 to 20 minutes, every 1 to 2 hours | 10 to 20 minutes, every 1 to 2 hours |
| Caution | Leaving ice on too long can damage tissue | No creams or rubs under heat; heat can drive them into the skin and cause a burn |
| Products | Instant cold packs, reusable cold packs | Instant hot packs, reusable hot/cold gel packs |
How long to ice an injury
Ice for 10 to 20 minutes, then take it off. Repeat every 1 to 2 hours during the first 24 to 48 hours. Cleveland Clinic warns that leaving ice on too long can cause tissue damage, so set a timer and follow the time on the pack's label.
When to switch to heat
After about 48 hours, heat can be used for 10 to 20 minutes at a time, every 1 to 2 hours. Don't put a heat pack over a pain-relief cream or rub: heat can push the cream deeper into the skin and cause a serious burn.
How instant cold and hot packs work
You squeeze or strike the pack to break an inner pouch. That mixes the contents and starts a reaction that turns the pack cold, or hot for hot packs, with no freezer or microwave needed. They're single-use, which makes them a staple for first aid kits, sports bags, schools and job sites. Follow each pack's label for activation and time on the skin.
- Instant cold packs: Medline Standard (3 sizes), Medline Deluxe Sweatless, Medline Deluxe with self-adhering wrap, Dynarex 5" x 9" and CURAD 5" x 6".
- Instant hot packs: Medline High-Performance, Medline Disc-Activated and Medline Deluxe Nonwoven.
Instant packs vs reusable gel packs
- Instant packs: single-use, no prep, good for kits and on-the-go use.
- Reusable gel packs: freeze for cold or warm for heat. They cost less per use for clinics, therapy rooms and home care. See the Medline Accu-Therm hot and cold gel pack wrap kit, single 5" x 10" gel packs and compress holders.
Browse all hot and cold therapy products, or see what else belongs in a first aid kit.
When to see a doctor
See a doctor if the injury isn't improving with time. After a hit to the head, get help right away for dizziness, vomiting, headache or confusion.
Frequently asked questions
How long should you ice an injury?
10 to 20 minutes at a time, every 1 to 2 hours, for the first 24 to 48 hours.
Is heat or ice better for swelling?
Ice, in the first 24 to 48 hours after an injury.
Can I use heat with a pain-relief cream?
No. Cleveland Clinic warns heat can drive the cream into the skin and cause a burn.
Can an instant cold pack be reused?
No. Instant packs are single-use. For repeated use, choose a reusable gel pack that you chill in the freezer.
This article is general information, not medical advice. Source: Cleveland Clinic, Heat or ice: which is better for treating minor injuries (June 2026).