正常人在感到疲劳时,常打几个哈欠,哈欠的深呼吸作用增加了氧气的吸入,可使人的疲劳暂时减轻。可是,中老年人,尤其是高血压、脑动脉硬化者,频频打哈欠,有可能是缺血性脑中风的先兆,应提高警惕。大约有70%80%的缺血性脑中风病的病人,在发病前一周左右,会因大脑缺血缺氧而频频出 Normal people feel tired when they often play a few yawns, yawn deep breathing increased oxygen inhalation can make people temporarily alleviate the fatigue. However, the elderly, especially those with high blood pressure and cerebral arteriosclerosis, frequently yawn and may be the precursor to ischemic stroke. Therefore, vigilance should be raised. About 70% of patients with ischemic stroke of 80% of the disease, about a week before onset, due to cerebral ischemia and hypoxia and frequent