There are many reasons why patients suddenly experience dizziness: 1, if the patient appears in the process of getting up, it is considered to be postural hypotension, and if the patient is a transient seizure when the head changes in a specific position, dizziness, visual rotation for less than a minute, it is considered to be caused by otolithiasis.2, if the patient has cerebral arteriosclerosis and cerebral insufficiency of blood supply, the patient suddenly becomes dizzy and dizziness with nausea, and the symptoms last for a long time, it is considered to be caused by otolithiasis. If the symptoms last for a long time, it is considered to be caused by cerebral blood supply insufficiency or cerebral stroke.3. If the patient suddenly suffers from vertigo, it may be caused by vestibular organ diseases, such as Meniere’s disease, labyrinthitis, vestibular neuronitis and other diseases, which can cause dizziness all of a sudden.