Right hemianesthesia is most commonly seen in patients with cerebrovascular disease, including transient ischemic attack, cerebral infarction, and cerebral hemorrhage; others can also be seen in other lesions of the brain, such as encephalitis, traumatic brain injury, and occupying brain tumors. If there is a more serious cervical spine disease, some patients can also have symptoms of partial body numbness, the most common of which is cerebral infarction or cerebral hemorrhage. If there are patients with cerebrovascular disease in the family, or patients with risk factors such as hypertension, hyperlipidemia, diabetes and smoking, the percentage of right hemianesthesia caused by cerebrovascular disease is very high.