What is the main purpose of applying cold to an injury?

Applying cold to an injury primarily serves to prevent or reduce swelling. When cold is applied, it causes blood vessels to constrict, which decreases blood flow to the affected area. This reduced blood flow helps limit the amount of fluid that accumulates at the injury site, thereby minimizing swelling. Swelling can lead to increased pain and prolonged recovery times, so controlling it is crucial for effective healing.

In contrast, while cold therapy may also provide some pain relief, its primary role focuses on managing inflammation and swelling. Improving circulation typically involves the use of heat rather than cold, as heat expands blood vessels and encourages blood flow. Lastly, while cold application can aid in the healing process indirectly by minimizing swelling, it does not speed up healing directly; other factors play a more significant role in the overall healing timeline.