Unlike what you see on television, a heart attack is not usually sudden or even obvious.不像你们在电视上看到，心脏病发作通常不是突然或什至明显。 In fact, many heart attacks can happen without a person even knowing they’ve had one.事实上，许多心脏病发作可能发生无一人甚至不知道他们已经有一个。 True heart attack symptoms often come on slowly.真正的心脏病发作的症状往往是对进展缓慢。 There may be a tightening sensation around the chest area, or it could feel as if you have a heavy weight on your chest instead.有可能是一个紧缩的感觉胸部周围地区，也可以感觉到如果您有一个沉重的重量而不是你的胸部。

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