Transcranial Doppler ultrasound, magnetic resonance imaging (MRI) of the brain, and cerebral angiography (DSA) are usually done to check the blood vessels in the brain. 1. Transcranial Doppler ultrasound: It is a non-invasive way to check for cerebrovascular disease. It can do ultrasound and transcranial Doppler examination of cervical blood vessels, evaluate the degree of plaque of atherosclerosis in intracranial and extracranial blood vessels, and also evaluate the speed of intravascular blood flow, the waveform of blood flow, and vasospasm. 2. Magnetic Resonance Imaging (MRI) of the brain: Through the action of a high-frequency magnetic field outside the body, the movement of the hydrogen nuclei of the brain tissue is recorded, and after a series of processing and conversion, it is imaged on a screen to assess the overall condition of the cranial and cerebral organs, and therefore also to examine the blood vessels in the brain. 3. Cerebral angiography (DSA): Cerebral angiography is a method of digitizing the optical images obtained from X-rays of the human body, removing the images of bones, brain tissue, and other parts of the body, and retaining the images of the blood vessels that are filled with contrast medium to produce real-time dynamic blood vessel images. It is possible to inject the contrast medium from the femoral artery and observe the flow of the blood vessels in the brain to determine whether the blood vessels in the brain are diseased. If you have symptoms such as dizziness, nausea, or limb weakness, please go to the hospital immediately for checkups, and maintain good habits in your life to avoid staying up late.