The main cause of cerebellar insufficiency is due to atherosclerosis or vasospasm of the vertebrobasilar artery. Atherosclerosis of the vertebrobasilar artery is common in middle-aged and elderly people, and patients often have a combination of hypertension, hyperlipidemia, hyperglycemia, hyperhomocysteinemia, some patients have bad habits such as smoking and drinking, and patients are often not good at exercise. There are various clinical causes of cerebral vasospasm, for example, cold weather can cause vasospasm, and patients with severe hypertension can also cause vasospasm. In addition, if the patient is highly stressed, it can cause sympathetic excitation, which can cause vasospasm and lead to cerebral blood supply deficiency. The main clinical manifestations of cerebellar insufficiency are dizziness, nausea, vomiting, and also dysarthria, ataxia, etc. Cranial CT examinations are generally normal.