Ice and heat are the oldest form of hot-cold therapy, and choosing between them is a common question. A cold plunge and a hot tub are the large versions of the same two tools.
This article sets out what Cleveland Clinic’s doctors say about each. It sits under our overview of contrast therapy benefits. It is general information, not medical advice: see a doctor for a serious injury or pain that doesn’t improve.
Short answer: use ice for new injuries and flare-ups, for 10 to 15 minutes and never more than 20. Use heat for lingering stiffness, sore muscles, and arthritis, for under 20 minutes, and keep moist heat at 92 to 100°F. For a strain or sprain, Cleveland Clinic suggests cold first, then heat once inflammation is under control.
When to use ice
According to Cleveland Clinic’s February 2025 article, ice suits fresh injuries and new aches. Its sports medicine physician, Anne Rex, DO, puts it this way:
“Ice wins to shut down swelling, inflammation and pain early on.”
Anne Rex, DO, sports medicine physician, Cleveland Clinic, 2025
The article lists ice for sprained ankles, a finger slammed in a door, tendinitis flare-ups, gout in a single joint, and headaches or migraines.
When to use heat
Heat suits longer-term problems: muscle knots, arthritis, tension headaches, tendinosis, and menstrual cramps. Rheumatologist Linda Mileti, MD, says patients with chronic osteoarthritis “usually feel better with heat.”
Moist heat counts. The article names baths, showers, hot tubs, and whirlpools as moist heat sources, and gives a target of 92 to 100°F (33 to 38°C).
Side by side
| Ice | Heat | |
|---|---|---|
| Best for | New injuries, flare-ups, swelling | Stiffness, knots, arthritis, chronic aches |
| Session length | 10 to 15 minutes; never over 20 | Under 20 minutes |
| Temperature | Cloth between ice and skin | Moist heat 92 to 100°F |
| Caution | Neuropathy, Raynaud’s; shorter for small joints | Can make a fresh injury feel worse at first |
Using both
The article says, “Sometimes, in fact, you might use BOTH ice and heat.” For a strain or sprain, it suggests cold first to limit inflammation and numb pain, then heat once inflammation is managed. That’s a sequence over days, not rapid switching. However, the article doesn’t recommend alternating back and forth within a session.
Limitations
This is expert guidance, not a trial. Although the advice is consistent, our source gives no study comparing ice and heat head to head for each condition.
Here’s what the spec sheet won’t tell you. Cleveland Clinic’s moist heat target tops out at 100°F. Hot tubs can run up to 104°F, the CPSC ceiling, which is warmer than that guidance.
My rule of thumb: if it’s swollen and new, ice; if it’s stiff and old, heat.
Bottom line: ice for new injuries and flare-ups, heat for lingering stiffness, both under 20 minutes. Use cold then heat over days for strains, not rapid switching. For hot-cold routines after exercise, see the contrast therapy benefits overview linked above.
Sources
- Cleveland Clinic, Health Essentials article on using ice or heat for pain, February 5, 2025: health.clevelandclinic.org
- U.S. Consumer Product Safety Commission, “CPSC Warns Of Hot Tub Temperatures,” release 79-071, December 31, 1979: cpsc.gov