[Inflammatory Responses in Hemorrhagic Stroke].

Inflammation is triggered by various intrinsic and extrinsic stimuli as a protective machinery to maintain homeostasis in the human body. Usually, it is magnified in intensity initially and regresses rapidly afterwards; this phenomenon is called acute inflammation. However, it occasionally lasts a long time; this phenomenon is called chronic inflammation. Induction of some specific machineries, i.e., formation of a positive feedback loop, inflammatory cell infiltration, and changes in tissue architecture, is required for the transition to chronic inflammation; this differentiates chronic and acute inflammation in nature. Chronic inflammation is a common pathogenesis of various diseases, including cancer, vascular disease, and stroke. Recent experimental studies have clarified the crucial role of inflammatory responses in the development and progression of hemorrhagic stroke mediated by tissue destruction or some other aspects of diseases. In this review, we summarize the research findings of the role of inflammation in hemorrhagic stroke.