Cerebellar ataxia is related to a variety of causes such as disease factors, drug factors and environmental factors. 1. Disease factors: cerebrovascular diseases such as aneurysm, cerebral hemorrhage, cerebral infarction, vascular malformation, etc., tumor diseases such as glioma and medulloblastoma of the brainstem, infectious diseases such as neurosyphilis, encephalitis of the brainstem, prion disease, etc., may all lead to cerebellar ataxia; in addition, Greene-Barre Syndrome and ethanol toxic cerebellar degeneration may also cause cerebellar ataxia. 2. Drug factors: some patients take levamisole, cytarabine, phenytoin sodium and other drugs may cause cerebellar ataxia. 3. Environmental factors: If the patient inhales toluene for a long time, toluene poisoning may occur, and cerebellar ataxia may occur, or the patient may consume water and food contaminated by organic mercury for a long time, resulting in organic mercury poisoning, which may also cause this symptom. There may be other causes of cerebellar ataxia. Cerebellar ataxia should be diagnosed and treated promptly.