Insomnia is not a precursor of cerebral infarction, but the patient’s prolonged and repeated insomnia can lead to cerebral vascular spasm, which can induce ischemic cerebrovascular disease, that is, the appearance of cerebral infarction. The most common precursor of cerebral infarction in clinical practice is vertigo, which is accompanied by nausea, vomiting and, in severe cases, numbness and weakness of the limbs, lasting for a few minutes. The patient should be given active treatment for this condition to avoid cerebral infarction. As a precursor of cerebral infarction, patients may also experience abnormally high blood pressure, blurred vision, blindness or partially blind visual field. At the same time, some patients may have precursors of cerebral infarction such as crookedness of the corners of the mouth. About one-third of patients can disappear the symptoms of neurological deficits after active treatment.