Arteriovenous short-circuiting depends on the site of the arteriovenous malformation, its size, and whether there is bleeding or ischemia. So, how to diagnose arteriovenous short circuit phenomenon? This is the most common symptom of intracranial arteriovenous malformation, with more than half of them developing between the ages of 16-35. Bleeding is not seasonally related and usually occurs during normal activity. The risk of bleeding increases during pregnancy. 2. Epilepsy May occur with intracranial hemorrhage or alone. Epilepsy occurs in patients with arteriovenous malformations due to: arteriovenous short-circuiting causing localized ischemia in the brain and glial-like changes in adjacent brain tissue; and the ignition effect of temporal lobe arteriovenous malformations. 3.Headache Most of them are the result of intracranial hemorrhage, except for this, about 43% of patients have persistent or recurrent headache before hemorrhage, often persistent headache. 4.Focal symptoms Depending on the site of vascular malformation, hematoma compression, cerebral blood circulation disorder and brain atrophy area. 5.Other symptoms Intracranial vascular blowing murmur, psychiatric symptoms, protruding eyes, vascular murmur, secondary intracranial hypertension, diplopia, heart failure and other symptoms.