Anyone who is found to have one of the above signs should go to hospital for early examination, including blood rheology test, cardiovascular ultrasound, cerebral blood flow, fundus and CT examination. Even if no pathological changes are found in the examination results, preventive treatment measures should be taken under the guidance of a doctor. As we all know, there are often some premonitory signs before a stroke attack, and timely prevention or treatment after the detection of the signs is indeed very different from the treatment effect after the stroke attack. Therefore, it is necessary to know a little bit about what are the omens before a stroke, both for stroke prone patients and their families. Some of the more common omens are: 1. Momentary blackness: appears suddenly in front of the eyes and can be recovered after a few seconds, without nausea, vomiting, impaired consciousness and limb paralysis. This is caused by a decrease in intracranial blood flow or a tiny blood clot passing through the retinal artery. Because, the ophthalmic artery is the first branch of the carotid artery and is the most sensitive to carotid artery sclerosis, stenosis and ischemia, so the black mask can be regarded as the earliest alarm signal of stroke. 2. Transient visual impairment: Blurred vision or visual field defects with paroxysmal episodes, mostly recovering on their own within an hour. This is the result of occlusion of the central retinal artery or branch arteries caused by reduced cerebral blood flow, but no cerebral neurological signs have yet appeared, which can be regarded as an early stroke forecast signal. 3, frequent yawning: This is due to the progressive aggravation of cerebral arteriosclerosis, the narrowing of the lumen, and the increasing ischemia and hypoxia of the brain. According to statistics, within 5 to 10 days before the onset of ischemic stroke, up to 80% of people yawn frequently. Therefore, do not ignore this signal. 4, twisted neck hand numbness: mostly occurs when the head turned to the side shaving, suddenly feel finger weakness, razor to the ground, some unclear speech, 1 to 2 minutes to recover. This is because when turning the head, causing the already hardened carotid artery twist, aggravating the results of the narrowing. This phenomenon is enough to warn people that stroke can occur at any time. 5. Transient ischemic attack: That is, there is a transient hemiparesis or monoparesis, possibly accompanied by aphasia, but of short duration, mostly recovering completely within 24 hours, which indicates that there has been a mild stroke. It can be taken as a precursor of progressive or complete stroke. 6. Dramatic or surge in blood pressure fluctuations in the elderly. Symptoms such as increased headache and dizziness and tinnitus, nervousness or drowsiness indicate the possibility of hemorrhagic stroke.