A brain ct with everything normal cannot completely rule out a cerebral infarction. Due to its own limitations, ct can only find positive results when a clear low-density shadow is formed in the infarcted area. In the first 4~6 hours of cerebral infarction, cerebral edema appears in the ischemic area, but at this time, ct examination is basically negative. Brain cell necrosis in the ischemic area 12~24 hours after cerebral infarction, ct can still be negative in most cases. Therefore, cerebral infarction cannot be completely ruled out by normal cranial ct report alone. If the patient has clinical localization signs such as monoparesis, hemiparesis, quadriplegia, etc., and the ct scan is negative, ct enhancement or magnetic resonance examination can be considered, which can help to further clarify the diagnosis. If there are any uncomfortable symptoms, it is necessary to go to the hospital as soon as possible, and the doctor will formulate individualized diagnosis and treatment plan according to the specific condition, so as to avoid delaying the condition.