How to Reduce Swelling After a Sprained Ankle

Cold therapy (ice application) is the first-line treatment. Applying cold offers two primary benefits: first, it helps reduce bleeding and swelling to some extent; second, the low temperature induces local numbness around the injured area, thereby providing analgesic effects. Ice packs, crushed ice, frozen popsicles, or ice cubes may all be used for cold therapy. Each application should last 15–20 minutes and may be repeated every 2–3 hours—or even hourly—as needed, taking care to avoid frostbite.

Heat therapy is strictly contraindicated, as it causes vasodilation of small blood vessels at the injury site, exacerbating hemorrhage and increasing tissue fluid exudation—thereby worsening swelling.

Moreover, topical applications such as safflower oil, Zhenggu Shui (a traditional bone-setting liniment), Huoluo Oil (a circulation-enhancing liniment), or Yunnan Baiyao (a traditional hemostatic and anti-inflammatory formula) are also not recommended. The underlying principle is identical: following soft-tissue injury, the microvascular network is disrupted, resulting in bleeding and fluid exudation. Blood components—including inflammatory mediators—leak into surrounding tissues, triggering an inflammatory response and further increasing exudate production, thereby intensifying erythema, swelling, heat, and pain. Applying blood-activating agents at this stage would only aggravate the condition—akin to “pouring oil on fire.”

If available, compression bandaging can be applied to the injured area. This serves two purposes: controlling hemorrhage and limiting interstitial space available for accumulation of tissue fluid—both of which are highly effective in preventing or reducing swelling.