Impaired vestibular function means that the function of vestibular organs such as semicircular canals, balloon and elliptic capsule is impaired, which is mainly related to the balance of the body, and the symptoms of its impairment mainly include vertigo, nystagmus, and balance disorders. 1. Vertigo: When the vestibular function is damaged, its balance is out of control, which can lead to the appearance of vertigo. It can be felt as a self-sense of rotation of surrounding objects or oneself, and is often accompanied by nausea, vomiting, and rapid heart rate. 2. Nystagmus: Regular diastolic movement of extraocular muscles is the main symptom of vestibular stimulation, which can be categorized into spontaneous nystagmus and induced nystagmus, and is the manifestation of abnormal vestibulo-ocular reflex. 3. Balance disorder: vestibular injury can lead to balance dysfunction, which is manifested as postural adjustment disorder. When unilateral vestibular function is impaired, it can lead to dizziness, nausea, vomiting as well as nystagmus-like swinging of the head and unsteady standing. Vestibular function is impaired by a variety of symptoms, once abnormal manifestations, attention should be paid to timely hospital consultation and treatment.