Talking nonsense after cerebral infarction is a disorder of consciousness caused by cerebral infarction. Patients with large cerebral infarction can develop delirium, and they can talk nonsense, while their ability to recognize the objective environment and their ability to react are reduced, their attention is incoherent, their orientation is impaired, their speech is increased, their thinking is incoherent, and most of them have disorders of the wake-sleep cycle, and they often have hallucinations or delusions. Patients mainly show nervousness, fear and excitement, and some patients even show shouting and even impulsive aggressive behavior. The illness is often fluctuating, worsening at night and decreasing during the day. Most of them have an acute onset and the duration usually varies from a few hours to a few days, and can last longer in individual patients. In addition, delirium is also seen in patients with prolonged fever. Patients who develop delirium should be treated accordingly by actively identifying the cause.