Physiologic hemostasis is usually a phenomenon in which blood flows out of a small blood vessel after an injury and the bleeding stops on its own after a few minutes. It is usually accomplished by the blood vessels, coagulation system, vascular endothelium and other three aspects. 1. Stimulation of local vasoconstriction after small vessel injury, thus causing a hemostatic effect. 2. After small blood vessel breakage, the coagulation system of blood is activated, and the fibrinogen in plasma is activated to fibrin, which constitutes a firm thrombus with platelets, thus hemostasis is carried out. 3. After endothelial injury, the endothelial tissue exposed by local injury activates the coagulation system, at this time, vasoconstriction can occur, blood flow is slow, platelet adhesion and aggregation occurs, forming a thrombus for hemostasis. It is recommended that when bleeding occurs, you need to go to the hospital in time according to the specific situation, and follow the doctor’s instructions to actively deal with it to avoid delaying the condition.