The second occurrence of cerebral hemorrhage may be caused by high blood pressure, blood diseases, abnormal cerebral vascular development, and smog disease. 1. High blood pressure: If the patient himself suffers from high blood pressure and the blood pressure is not well controlled, it may lead to the second occurrence of cerebral hemorrhage. 2. Blood diseases: the second occurrence of cerebral hemorrhage may also be caused by blood diseases such as erythrocytosis, hemophilia, leukemia, thrombocytopenic purpura, and so on. 3. Abnormal cerebrovascular development: patients who have had a cerebral hemorrhage after the occurrence of aneurysms, arteriovenous malformations, intracranial tumors, vasculitis and other diseases may also have a cerebral hemorrhage again. 4. Others: patients with smog disease, venous sinus thrombosis and other conditions, or antiplatelet and anticoagulant therapy may also lead to the second occurrence of cerebral hemorrhage. Patients with a second brain hemorrhage need to consult a doctor in time, and the doctor will choose the appropriate measures for the patient’s specific situation.