The most common diseases that cause sudden onset of slurred speech in the elderly are cerebrovascular accidents, including cerebral hemorrhage, cerebral infarction, and transient ischemic attack. Since the left hemisphere is the dominant hemisphere for language, lesions in the left hemisphere are more likely to result in slurred speech, mostly in the early morning or in the middle of the night, with sudden onset of slurred speech, slurred speech, some patients may have language expression and comprehension impairment, and may also have symptoms such as drooling, corner of the mouth distortion, tongue extension deviation, weakness of one limb or even hemiparesis, mostly accompanied by sensory abnormalities. Some patients may have dizziness, nausea, vomiting, unsteady gait and other ataxic manifestations, and in severe cases, drowsiness, even coma and other symptoms of impaired consciousness. If there is sudden onset of slurred speech, it is necessary to send to the hospital immediately to improve the examination to exclude cerebrovascular disease, and some patients with cerebral infarction can completely recover from slurred speech and other symptoms if they can be treated in time.