Inflammation

Inflammation is an immunological process to protect the organism from environmental factors and pathogens that cause infections. Inflammation activates immune cells to eliminate pathogens. In response to pathogen exposure the inflammation starts with five characteristic symptoms including 1) redness, 2) swelling, 3) heat, 4) pain, and 5) transient loss of function of the inflammatory tissue (Calder, 2003). 
Inflammation is mediated through eicosanoids and involves interactions among many immune cell types. When the pathogen or environmental molecule is eliminated, the inflammatory response is overcome and down-regulates itself by the formation of anti-inflammatory mediators such as cytokines and eicosanoids, which interrupt pro-inflammatory pathways (Calder, 2003).