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When the body's immune system detects an injury or infection, it responds by increasing the flow of blood and attracting various immune cells (such as white blood cells) to the injured or infected area, where they work to eliminate the problem and repair the injured tissue. However, this increased blood flow, and the subsequent enlarging of the tissues in the affected area, also brings about the pain, swelling, redness, heat, and loss of function characteristic of inflammation.

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