The main function of platelets is to clot and stop bleeding, which can repair broken blood vessels. If platelets are low, the coagulation and hemostatic functions are weak, so it is easy to have rupture and bleeding of cerebral blood vessels, and in severe cases, intracranial hemorrhage can occur. For thrombocytopenia, it can be seen clinically in platelet production disorders, such as aplastic anemia or acute leukemia, as well as in thrombocytopenia caused by radiation. Then again, thrombocytopenia can also be seen in increased platelet destruction, such as primary thrombocytopenic purpura, or some liver function abnormalities leading to hypersplenism, which can also lead to thrombocytopenia. Among other clinical conditions, there are also diseases that can lead to increased platelet consumption, such as diffuse intravascular coagulation, or familial thrombocytopenia, all of which can cause patients to have low platelets, leading to reduced coagulation and hemostatic function of platelets and predisposing them to cerebral hemorrhage.