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Hot and Cold Therapy: When to Use Ice vs Heat for Pain, Injury and Surgery
When to use ice vs heat comes down to timing: ice for a new injury or after surgery, and heat for stiffness once swelling settles. This guide explains ice or heat for injury, how long to ice an injury and when an ice machine after surgery makes sense.
- A simple rule for choosing ice or heat
- How long to ice or heat at a time, from trusted medical sources
- Packs, wraps and machines for the knee, shoulder, back and ankle
Calm Swelling Early
Cold helps settle swelling and pain in the first days after an injury or surgery.
Loosen Stiff Joints
Heat relaxes tight muscles and helps stiff joints move more easily.
Recover in Comfort
Packs, wraps and machines bring steady cold or warmth to the exact spot that hurts.
At a Glance
- Use ice for new injuries and swelling; use heat for stiffness and tight muscles.
- For new low back pain, ice for the first 48 to 72 hours, then heat.
- Keep most ice and heat sessions short, with a cloth between the pack and your skin.
- Cold therapy machines keep cold steady after surgery; ice packs suit minor sprains.
- Many braces have pockets for hot and cold packs, so you get support and cold together.
48 to 72 hoursof ice, then heat, is one good method for new back painSource: MedlinePlus (NIH)
20 to 30 minof ice, 3 or 4 times a day, for a sprained ankleSource: AAOS OrthoInfo
10 to 15 minof ice or heat at a time is long enough for most minor injuriesSource: Hospital for Special Surgery
Ice or heat for injury is one of the most common questions we hear. The answer changes with time, so the right choice on day one may be the wrong one a week later.
This guide gives you a simple rule, safe timing from trusted medical sources and the products that make hot and cold therapy easy at home.
What Is Hot and Cold Therapy?
Hot and cold therapy means using heat or cold on your body to ease pain. Cold therapy, also called cryotherapy, cools the area with ice packs, gel packs, cold wraps or a machine that circulates cold water. Heat therapy warms the area with heat packs, warm water or a machine that circulates warm water.
Cold and heat do opposite jobs. According to Hospital for Special Surgery, ice is best for acute injuries such as sprains, strains and pulled muscles, while heat is best for chronic pain or after swelling has gone down. Choosing the right one at the right time makes a real difference in how you feel.
Signs Ice or Heat Can Help
- A new sprain, strain, bump or bruise (ice)
- Swelling after surgery (cold therapy as your surgeon directs)
- A flare of tendinitis (ice)
- Stiff joints from arthritis (heat)
- Tight, knotted muscles in the back or neck (heat)
When to Use Ice vs Heat
The simplest rule is ice for new, heat for old. Here is how that plays out.
New Injury: Ice
Use cold in the first days after a sprain, strain or surgery, when swelling is building.
Long-Term Stiffness: Heat
Use warmth for arthritis stiffness, tight muscles and aches that have lasted weeks.
Strains and Sprains: Both
Start with cold to manage swelling, then switch to heat for stiffness once swelling settles.
See a doctor if you can't put weight on an injured leg, a joint looks out of place, or pain and swelling keep getting worse. Back pain with numbness, weakness, fever or trouble controlling your bladder needs care right away. Ice and heat ease symptoms; they don't treat the cause of an injury.
Who Benefits From Hot and Cold Therapy?
Almost anyone with pain from an injury, surgery or stiff joints can use hot and cold therapy. These are the people we help most.
People Recovering From Surgery
Cold therapy machines keep cold steady after knee, shoulder, hip, back or ankle surgery.
People with a Sprain or Strain
Ice packs and cold wraps help in the first days after the injury.
People with Low Back Pain
Packs that slip into a back brace give cold or heat while you move.
People with Arthritis
Heat loosens stiff joints, especially in the morning.
Athletes and Active Adults
Cold wraps help after hard workouts and minor injuries.
How Do Ice and Heat Ease Pain?
Cold and heat work on your body in different ways, which is why timing matters.
Cold Limits Swelling
Cold narrows blood vessels near the skin, which helps slow swelling after an injury.
Cold Dulls Pain
Cooling the area slows nerve signals, so sore spots hurt less for a while.
Heat Loosens Stiffness
Warmth relaxes tight muscles and helps stiff joints move more easily.
Cold therapy machines add steady, controlled cold. Instead of an ice pack that warms up in minutes, a machine pumps chilled water through a pad, so the cold stays even. Some machines also add compression or switch to heat.
What Are the Different Types of Hot and Cold Therapy Products?
Hot and cold therapy products range from simple packs to machines. The right one depends on how long you need it and where it hurts.
Cold Therapy Machines
Pump ice water through a pad for steady cold after surgery.
Hot and Cold Therapy Machines
Circulate cold or warm water, so one unit does both jobs.
Cold Compression Wraps
Shaped wraps with a pump or straps that add cold and squeeze to one joint.
Gel Packs and Inserts
Reusable packs that go in the freezer or microwave, some sized to fit inside braces.
Braces with Cold Packs
Ankle and back braces with built-in pockets or gel cells for support and cold together.
Product typeCold or heatBest forKey detailCommon HCPCS
Cold therapy machineColdRecovery after surgerySteady cold for longer sessionsVaries
Hot and cold therapy machineBothRecovery, then stiffnessSwitches between cold and warm waterE0218
Cold compression wrapColdSprains, strains, sore jointsShaped to one joint, adds squeezeVaries
Gel pack or brace insertCold or heatBack pain, minor injuriesFits in a brace pocketVaries
Brace with gel cellsColdAnkle sprainsSupport and cold togetherVaries
Ice vs Heat for a New Injury
For a new injury, choose ice. AAOS OrthoInfo advises applying ice right away to a sprained ankle to keep swelling down, along with compression and raising the leg. It notes that swelling and pain usually last 2 to 3 days. Heat can make a fresh injury feel worse at first, so save it for later.
- Ice as soon as you can after the injury.
- Wrap the joint and raise it above your heart when you rest.
- Switch to gentle heat once swelling has settled and stiffness is the main problem.
Cold Therapy Machines After Surgery
An ice machine after surgery keeps cold steady for longer than ice packs, without trips to the freezer. You fill a small cooler with ice and water, and a pump moves the cold water through a pad wrapped around your knee, shoulder, hip, back or ankle. Many surgeons recommend one after joint surgery.
Follow your surgeon's instructions for how long and how often to use it. Keep the pad over your bandage or a thin cloth, never on bare skin, and check your skin often while the area is numb.
- Universal pads fit several joints; joint-specific pads fit more closely.
- Some machines add compression to help with swelling.
- Look for a quiet pump if you plan to use it during rest.
Cold Therapy Machine vs Ice Packs
Is a cold therapy machine better than ice packs? For a few days of icing a minor sprain, ice packs work well and cost less. After surgery, when you need cold many times a day for days or weeks, a machine is easier and keeps the cold steady.
- Ice packs: low cost, easy to take anywhere, warm up quickly.
- Cold wraps: shaped to one joint, add compression, still need refreezing.
- Machines: steady cold for longer sessions, best after surgery.
Hot and Cold Therapy Machines
A hot and cold therapy machine circulates either cold or warm water through a pad, so you can switch without changing products. That is useful when you need cold early in recovery and heat for stiffness later. It also helps with conditions that flare, such as arthritis or old injuries.
- Digital controls let you set the temperature.
- One pad can be used for cold early and heat later, if your doctor agrees.
- Some hot and cold machines carry HCPCS code E0218.
Best for switching between hot and coldBrace Direct IcedHeat Hot and Cold Water Circulating Therapy MachineHCPCS: E0218View product
Is Ice or Heat Better for Lower Back Pain?
For new lower back pain, start with ice, then switch to heat. MedlinePlus suggests one good method is ice for the first 48 to 72 hours, then heat. It also notes that most people with back pain improve within 4 to 6 weeks, often sooner.
Heat therapy for back pain works well once the first flare settles, because warmth relaxes tight back muscles. Gentle movement helps too, so try to stay active instead of resting in bed.
Can You Wear an Ice Pack Under a Back Brace?
Yes, if the pack is made for it. Many back braces have a pocket in the back panel that holds a slim hot or cold pack, so you get support and cold at the same time. Keep a layer of fabric between the pack and your skin.
- Ice the back for short sessions with a cloth barrier.
- Switch to heat once the first flare settles.
- Call your doctor about back pain with numbness, weakness or fever.
Heat Therapy for Stiff Joints
Heat is the go-to for stiff joints and long-term aches. Hospital for Special Surgery notes that heat may work better for general chronic stiffness. It advises removing the heat source after 10 to 15 minutes.
- Use heat before activity to loosen up.
- Skip heat on a joint that is red, hot or swollen.
- Remove heat if the area gets uncomfortably warm.
How Long Should You Ice an Ankle?
For a sprained ankle, AAOS OrthoInfo says ice can be used for 20 to 30 minutes, 3 or 4 times a day. It also advises raising the ankle above your heart as often as possible during the first 48 hours. Never put ice directly on your skin.
After ankle surgery, use cold only as your surgeon directs. If you wear a walking boot, ask your doctor whether you can take it off to ice while you rest with the foot raised. Put the boot back on before you stand.
- Gel packs shaped for the ankle wrap around both sides of the joint.
- Ankle braces with gel cells add support and cold together.
- Stop if the skin turns white, numb or very red.
How Long to Ice or Heat at a Time
Shorter sessions repeated through the day work better and are safer than one long one. Hospital for Special Surgery says 10 to 15 minutes of ice is long enough for most minor injuries. Advice for specific injuries can differ, such as the longer sessions AAOS describes for a sprained ankle, so follow your doctor's plan.
- Use a timer so you don't fall asleep with ice or heat on.
- Let the skin return to normal temperature between sessions.
- Take extra care if you have nerve damage or Raynaud's, since you may not feel cold or heat well.
Choosing a Cold Therapy Wrap for Knee, Shoulder, Back or Ankle
A cold therapy wrap is shaped for one joint, so the cold reaches the whole area evenly. Knee wraps circle the joint, shoulder wraps cap the top of the arm, back wraps cover the low back and ankle wraps fit around the heel. Many add compression with a hand pump or straps.
- Match the wrap to the joint for the best contact.
- Compression wraps add gentle squeeze along with cold.
- Freeze the cold insert ahead of time so it is ready when you need it.
Best cold compression wrap for the shoulderBrace Direct Cryotherapy Air Pump Shoulder WrapView product
Getting the Most From Hot and Cold Therapy
Always Use a Barrier
Place a thin cloth or towel between ice or heat and your skin to prevent frostbite or burns.
Set a Timer
Keep sessions short and spaced out, and never sleep with an ice pack or heating pad on.
Check Your Skin
Look at the area after each session. Blisters, white or gray patches, or numbness that lingers mean stop and call your doctor.
Raise and Rest
Prop an injured arm or leg above your heart while you ice to help with swelling.
Insurance and HCPCS Codes
Some hot and cold therapy devices have an HCPCS code, the billing code Medicare and insurers use for medical equipment. We don't bill insurance, but you can submit your receipt to your insurer for possible reimbursement. Most of our products are also HSA and FSA eligible.
E0218 Hot and cold water circulating machines
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Shop Ankle and Foot Cold TherapyFrequently Asked Questions
Should I use ice or heat on a new injury?
Use ice on a new injury. Cold helps calm swelling and pain in the first days, while heat can make a fresh injury feel worse. Switch to heat once swelling has settled.
Suggested: Brace Direct Ankle & Foot Gel Ice Pack
How long should I ice after surgery?
Follow your surgeon's instructions, since they depend on the surgery. Keep a barrier between the pad and your skin and check your skin often, because the area may be numb.
Is a cold therapy machine better than ice packs?
For surgery recovery, a machine is usually easier because it keeps the cold steady for longer sessions. For a minor sprain, ice packs work well and cost less.
Suggested: Brace Direct FrozenIce Cold Therapy Machine or Breg Polar Care Cube Cold Therapy System
When should I switch from ice to heat?
Switch once swelling has settled and stiffness is the main problem. For new low back pain, MedlinePlus suggests ice for the first 48 to 72 hours, then heat.
Can I use heat on a swollen joint?
It's best not to. Heat can increase swelling in a joint that is red, hot or puffy. Use cold until the swelling goes down.
How long can you leave a hot or cold pack on?
Keep most sessions short. Hospital for Special Surgery suggests 10 to 15 minutes of ice or heat at a time. Follow your doctor's plan for a specific injury.
Is ice or heat better for lower back pain?
Ice is usually better for the first few days of new back pain, then heat. Heat helps relax tight back muscles once the first flare settles.
Suggested: Brace Direct Back Ice Pack Insert
Will insurance cover a cold therapy machine?
It depends on your plan. We don't bill insurance, but you can submit your receipt to your insurer for possible reimbursement. Most of our products are HSA and FSA eligible.