Hazards caused by cerebral angiography include: hazards caused by contrast injection, accidents caused by too many punctures, and accidents caused by the contrast agent itself. 1. Hazards arising from the operation of contrast agent injection: contrast agent will be used in cerebral angiography, and the injection speed and pressure are too high, which will lead to aneurysm rupture and hemorrhage and cause neurological damage. 2. Accidents caused by too many punctures: if too many punctures are made during the imaging process, hematoma at the local puncture site and retroperitoneal hematoma may occur, resulting in the formation of femoral artery pseudoaneurysm. 3. Accidents caused by itself: people with impaired renal function may suffer from renal failure due to the use of contrast media; or some people are allergic to the components of contrast media, which may induce allergic reactions. Cerebral angiography is a commonly used examination method in neurology department. Doctors will fully evaluate the patient’s situation, balance the pros and cons, and operate under the premise of ensuring safety, and consult the doctor in time if there is any discomfort after the operation, so as to avoid any delay in the condition.