Ice or heat? The real answer.

The internet is split on ice vs heat, and both sides are right — just about different things. Here's a clean decision tree based on time, tissue, and type of pain.

Use ice when…

• The injury happened in the last 48 hours. Ice reduces acute inflammation and slows nerve conduction, which dulls pain.
• There's visible swelling or bruising.
• Right after an aggravating activity. A tennis session that fires up a chronic tendon issue — ice for 15 minutes after.
• Sharp, "hot" pain.

How to ice: 15–20 minutes, wrapped in a thin towel. Off for at least 45 minutes before reapplying. Never sleep on an ice pack.

Use heat when…

• The pain is more than 48–72 hours old and dull, tight, or stiff.
• You're warming up before movement or stretching. Heat increases blood flow and tissue extensibility.
• Chronic muscle tension — traps, low back, hip flexors.
• Menstrual or referred abdominal cramping.

How to heat: 15–20 minutes of moist heat if possible (a hot shower, a damp warm towel, or a moist heating pad). Never fall asleep on a heating pad.

Never use either when…

• The skin is broken, numb, or has poor sensation
• You have circulatory issues, diabetic neuropathy, or Raynaud's — check with your clinician first
• The area is already extremely hot to the touch (possible infection)

The "contrast" method

For subacute injuries (3–14 days old) in an extremity — ankle, wrist, elbow — some evidence supports alternating: 3 minutes heat, 1 minute ice, repeated 3–4 times, ending on ice. It's a pump for the tissue.

The bottom line

• New, sharp, swollen → ice.
• Old, dull, tight → heat.
• When in doubt → whichever one feels better (for chronic pain, comfort predicts benefit).

Educational information reviewed by operators of The Joint Chiropractic Rosemead — not medical advice. Always consult a licensed clinician for your specific situation.