What causes the symptoms of inflammation?
When inflammation occurs, chemicals from the body are released into the blood or affected tissues. This release of chemicals increases the blood flow to the area of injury or infection and may result in redness and warmth. Some of the chemicals cause a leak of fluid into the tissues, resulting in swelling. This process may stimulate nerves and cause pain.
From: Inflammation of Joints and Bone With Arthritis WebMD Medical Reference
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