Immunology covers every aspect of the immune system in both health and diseases. The immune system that contains various biological structure and process can protect against diseases induced by pathogens and distinguish them from the organism’s own healthy tissue. Inflammation is one of the first responses of the immune system to defend the body from injury or infection by releasing eicosanoids and cytokines. In addition, growth factors and cytotoxic factors also regulate inflammatory response by recruiting immune cells to the site of infection and to promote repairing of damaged tissue and removal of pathogens.