The harm of cerebral vasospasm is easy to cause cerebral ischemia and cerebral infarction. 1. Cerebral ischemia: cerebral blood flow is reduced in patients with cerebral vasospasm, and long-term insufficient cerebral blood supply will cause cerebral ischemia, which will lead to dizziness, vertigo, weakness of hands and feet, difficulty in speech expression, vision loss, poor body coordination, blurred consciousness, and even symptoms of coma. 2. Cerebral infarction: Cerebral vascular spasm can lead to reduced cerebral blood flow. If the disease is further aggravated, it can cause ischemia and hypoxia in the range of cerebrovascular blood supply, which will lead to cerebral infarction, with symptoms such as headache, vomiting, sensory impairment, aphasia, ataxia, hemiparesis, coma and so on, and the condition is serious enough to jeopardize the patient’s life. Patients with cerebral vasospasm should go to the hospital in time and be treated under the guidance of the doctor to avoid delaying their condition.