The main clinical diseases that cause dizziness are the following: 1. Meniere’s disease: Patients often have vertigo for several hours to more than a day, and it is accompanied by tinnitus and hearing loss, eye vibration. The pathology of the disease is a “fluid accumulation in the endolymphatic system” of the inner ear, but the true mechanism is still unclear. Many doctors attribute all vertigo to this disease, but in fact, the diagnosis of vertigo can only be made after hearing examination and long-term medical history. 2. Vestibular neuritis: It often occurs soon after a cold and suddenly becomes very severe vertigo and vomiting. The patient’s hearing is normal and he is sober, but the vertigo is so strong that he is afraid to move when lying in bed, accompanied by violent eye vibration. 3. Psychogenic: Some people will get dizzy for no reason because of nervousness, poor sleep, or emotional factors. This kind of dizziness is not very strong and usually recovers after a while, but sometimes it lasts for most of the day. 4. Benign paroxysmal cephalalgia: This kind of patient has a poor tolerance for movement, especially neck movement. The slightest head movement, such as a slight discomfort while riding in a car, or an emergency brake, or a car turning, will cause vertigo, and it will pass within a few seconds. These people are more likely to be excited by the inner ear vagus, so they may want to do more gymnastics and light exercise to train. 5.Complications of chronic otitis media: In chronic otitis media, especially in patients with cholesteatoma, sometimes the semicircular canal is damaged, causing vertigo due to the “labyrinthine group”, so chronic otitis media should be treated actively to avoid complications. 6. Brain tumor and brain injury: The common tumor is the auditory neuroma that grows between the cerebellum, and the patient may have unilateral hearing impairment, headache and vertigo. In addition, patients with stroke or brain injury in car accident may also have vertigo. 7. Systemic diseases: Patients with high blood pressure, diabetes and asthma often have vertigo. Sometimes patients who take anti-hypertensive or diabetic drugs may have low blood pressure or blood sugar due to drug overdose, which may also cause vertigo. 8. Otic syphilis: There are many patients with vertigo who do not have obvious syphilis symptoms, but the test results show positive syphilis seropositivity. This disease means that the lesions of syphilis enter the inner ear, causing vertigo, hearing loss and tinnitus, ataxia, diplopia, dysphagia, facial paralysis and other complicated symptoms. In addition, diseases such as epilepsy and migraine may also be accompanied by vertigo symptoms. 9. Insufficient function of the basilar artery: The blood supply to the inner ear and cerebellum mostly comes from the basilar artery of the crestal vertebrae.