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is a process that causes an area of the body to become red and swollen.
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Immediately following an injury, the traumatized area becomes red, warm, and painful, and it begins to swell. The swelling process, also known as edema, is the result of acute inflammation, a response triggered by damage to living tissues.

Redness, heat, swelling and pain are associated with this first stage. Redness and heat are caused by increased blood flow. Swelling is the result of the increased movement of fluid and white blood cells into the injured area. The release of chemicals and the compression of nerves in the area of injury cause pain.

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