是不是血管出了问题？

我今年５２岁，平时身体尚好，没有大毛病．但最近几天，我感觉头顶发沉，血压在１４０＼９０，但不是很稳定．平时血压偏低一些．从昨天开始，两条腿从膝盖下发凉，有一点发沉，但不严重．吃了两天牛黄清心丸，也没有

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