1. Are all cerebral hemorrhages caused by high blood pressure? Are there other diseases that can cause it? The most common type of cerebral hemorrhage in China is hyperemic cerebral hemorrhage. However, for cerebral hemorrhage in patients <65 years old, women, non-smokers, lobar hemorrhage, rupture into the ventricles, and cerebral hemorrhage without a history of hypertension or coagulation dysfunction, the possibility of underlying vascular abnormalities should be considered, and the combination of cerebral arteriovenous malformation, cerebral aneurysm, brain tumor, smog and cerebral venous thrombosis should be identified. 2. Can we know if there is bleeding caused by other diseases if we just have a CT examination? If there are abnormal findings on CT in addition to the hemorrhagic foci, it often indicates bleeding caused by underlying diseases: (1) combined with subarachnoid hemorrhage, suggesting possible rupture of cerebral aneurysm (2) vascular dilatation or calcification at the edge of the hematoma, suggesting possible rupture of cerebral arteriovenous malformation and bleeding (3) high-density shadow along the venous drainage or dural venous sinus or cortical venous course, suggesting possible cerebral venous thrombosis (4) very Seeing morphological hematoma, the extent of edema appearing out of proportion to the presumed duration of ICH, hemorrhage at uncommon sites, and the presence of other structural abnormalities in the brain suggest hemorrhage due to intracranial occupancy and other causes 3. Which patients are prone to detect hemorrhage from other causes? Patients without a history of hypertension and <55 years of age with lobar hemorrhage are most likely to have secondary causes of cerebral hemorrhage identified on further MRI or cerebrovascular examination. 4. If a patient has no history of hypertension and hypertensive cerebral hemorrhage is not considered, what other tests are needed to know exactly what caused the hemorrhage? To further clarify the cause of the bleeding, CTA, CTV, enhanced CT, enhanced MRI, MRA, MRV and DSA are usually required as an optional test based on the patient's condition assessment to further clarify the diagnosis and treatment.