Dizziness is referred to in Wikipedia as: impairment of spatial perception and balance perception, it is imprecise and is used to indicate: vertigo, imbalance, pre-syncope and non-specific light-headedness. (1) Dizziness can be classified into the following categories based on symptoms: Jin Zhanguo, Department of Otolaryngology, Head and Neck Surgery, Air Force General Hospital: vertigo: an idiosyncratic symptom, feeling that the environment is rotating, especially after activity; imbalance: a sense of instability or insecurity, without rotation, difficulty in standing or walking; light-headedness: a feeling of “swimming”, floating, dizziness or Pre-syncope: a transient, immediate feeling of loss of consciousness and fainting. (2) Possible disease types corresponding to several types of dizziness symptoms: (1) Vertigo is present in about half of the patients with dizziness; in addition, vertigo symptoms are usually caused by dysfunction of the vestibular system, so vertigo is classified according to the site of onset: vestibular peripheral diseases: common causes: benign paroxysmal positional vertigo, also known as otoliths, and vestibular neuritis, Meniere’s disease, etc.; while vestibular central diseases include: migraine associated vertigo, also called vestibular migraine, and diseases such as posterior circulation ischemia, tumors, and demyelination. ② Imbalance: mostly caused by neurological disorders, such as visual impairment, profound sensory impairment, cerebellar lesions, ataxia, etc. ③pre-syncope: mostly caused by cardiovascular system: including hypotension, anemia, hypovolemia, hypoglycemia, severe cardiac arrhythmia, etc. ④Head heavy: this type of non-rotational dizziness is difficult to define and is mostly associated with psychiatric disorders (such as depression, anxiety, panic, somatization disorders, etc.), as well as other medical disorders, adverse drug reactions, etc.