Heat, Ice or Anti-Inflammatories: Which Should You Use?

Heat, ice, or an anti-inflammatory? These questions come up constantly in clinical practice. All three are genuinely useful, but for different situations, and using the wrong one can make things worse, at least temporarily. Here's a clear way to think about each.

When to use ice

Ice is most useful in the first 24-48 hours after an acute injury where there is significant swelling: an ankle sprain, a direct blow to the muscle, a fresh joint injury. Cooling reduces nerve conduction velocity, which has a pain-reducing effect. It may also help limit secondary tissue damage in the immediate post-injury period.

How to use it: 10-15 minutes on, 30-45 minutes off. Always with a cloth between the ice pack and the skin to prevent ice burns. Not directly on areas with poor circulation or reduced sensation.

When to use heat

Heat is better for chronic, tight, or stiff tissues: muscle tension headaches, persistent lower back ache, tight calves or hamstrings before exercise, or any pain that feels better in a hot shower. Heat increases blood flow, relaxes muscle tone, and reduces pain through a different mechanism to ice.

How to use it: 15-20 minutes, not so hot that it marks the skin. A wheat bag, heat pack, or warm shower all work.

The simple rule

• Acute injury with swelling: ice for the first 24-48 hours
• Chronic pain, stiffness, or muscle tightness: heat
• Swelling has settled after a few days but the area is still painful: either can help - try heat
• Before exercise (to loosen up): heat or movement, not ice
• After exercise when sore: either is fine - personal preference

What about anti-inflammatories?

Anti-inflammatory medications (NSAIDs like ibuprofen, naproxen, and diclofenac) are effective at reducing pain and swelling in the short term. But inflammation is not purely a problem to be suppressed. It's a necessary phase of healing: inflammatory cells clean up damaged tissue, release growth factors that trigger repair, and signal the surrounding tissue to regenerate.

Studies on tendon and bone healing consistently show that NSAID use in the early phases of injury reduces the quality and speed of repair. Tendon healing appears particularly sensitive: the collagen produced under NSAID use is less well-organised and potentially weaker. For acute fractures, NSAIDs are generally avoided for the first six weeks.

NSAIDs are still appropriate in some situations:

• Acute muscle strain in the first 24-48 hours, where pain control is needed to maintain movement
• Bursitis and synovitis, where excess fluid production is the problem
• Acute spinal pain with nerve irritation - short course, not longer than 5-7 days
• When pain is severe enough to prevent sleep or rehabilitation

When pain relief is the goal without suppressing the healing response, paracetamol is a reasonable alternative. Topical NSAIDs applied to the skin achieve a local effect with far lower systemic exposure and are a sensible compromise for tendon and joint pain. Check with your GP or pharmacist before starting any medication.