There is a kind of vertigo which is only dizziness, light-headedness, shaking and unsteadiness, or even falling, but it does not deviate to one side, there is no clear sense of motion of the surroundings or its own rotation, and there is no nystagmus, which is called pseudovertigo or non-systemic vertigo. The examination methods mainly include: 1. Cranial ultrasound examination B-type ultrasound cranial examination method: mainly used for children within 2 years of age whose fontanelle is not closed, through the fontanelle as a “sound window” for scanning. Transcranial color Doppler imaging: Through temporal window, occipital window and orbital window, it can detect cerebral arteries and determine the flow velocity, frequency width, abnormal flow direction or audio abnormality of intracranial vessels, which is used in the diagnosis and etiological classification of cerebrovascular diseases. 2.Cranial CT examination CT examination of the skull is a method to examine the skull through CT. Cranial CT is a new examination method which is convenient, rapid and safe, painless and non-invasive, and it can clearly show the anatomical relationship of different cross-sections of the cranial brain and the specific brain tissue structure. Thus, it greatly improves the detection rate of lesions and the accuracy of diagnosis. In general, CT has better visualization of human hard tissues than soft tissues. Cranial CT examination is important for the diagnosis of most diseases of the intracranial, cranial, and scalp (including trauma, tumors, inflammation, vascular lesions, poisoning, degenerative and metabolic diseases, etc.).