Recovery

Ice or heat? What to use for aches and minor injuries

Cold tends to help fresh, swollen injuries and acute pain; heat tends to help stiffness and long-standing muscle tension. Neither heals tissue on its own.

Cold and heat are two of the oldest home remedies for sore bodies, and both can help when used for the right problem. Cold narrows blood vessels and dulls nerve signals, which reduces pain and can limit swelling in the first day or two after a minor sprain, bump or strain. Heat does the opposite: it widens blood vessels, relaxes muscle tension and makes stiff tissue feel more mobile, which suits chronic aches, a tight lower back or stiffness before activity.

The old advice to ice every injury for days has softened. Inflammation is part of normal healing, and research suggests that heavy, prolonged icing does not speed recovery and may even blunt some training adaptations when used routinely after workouts. For a fresh minor injury, short cold applications of 10 to 15 minutes for pain relief are reasonable, alongside relative rest, gentle movement as pain allows and gradual return to load. Heat packs or a warm shower are better choices for muscle tightness that has no swelling.

Always put a cloth between the skin and ice or a heat pack, check the skin regularly and avoid both on areas with reduced feeling, such as in people with diabetic neuropathy. Do not apply heat to a fresh, hot, swollen injury. See a doctor if you cannot bear weight, if there is a visible deformity, numbness or severe swelling, or if pain does not improve within a week or two. Cold and heat manage symptoms; well-dosed movement is what rebuilds the tissue.

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