An inflammatory response is a defense mechanism that combats injury or disease. The affected cells release chemicals that aid in removing the cause of harm.
An inflammatory response occurs when tissues are attacked by toxins or bacteria or injured by heat or other causes. It is a part of the healing process, typically causing the affected area to swell and become hot. Redness, pain and tenderness are associated symptoms of inflammation.
Inflammation causes the cells affected by injury to release chemicals as a response. These chemicals cause surrounding blood vessels to leak fluids into the area. These fluids cause the cells to swell, which serves to isolate the region, keeping the cause of injury away from any surrounding healthy tissues.