If you were to ask people to name the most remarkable work of engineering this world has ever seen, they may respond by saying a NASA built space rocket, or a Tesla electric car, maybe even an airplane. Very few people stop to consider that their own body may just be the most incredible thing ever created.

The human body is, without doubt, one of the best design feats known to man. After all, without the human body, all of the other contraptions in the world would not exist.

Despite that, humans don’t come with an instruction manual. So it can be very difficult to know exactly how to program such a contraption. Thankfully there are plenty of doctors and scientists on hand to help us all reach our body’s full potential.

One way in which they can do this is by monitoring the body’s behavior before a particular organ fails, in order to help us detect a disaster before it’s too late. For example, there are several signs that precede a heart attack.

In order to possibly preempt a heart attack in yourself, or somebody you love, play close attention to the following eight symptoms that commonly occur before the heart goes haywire…

1. Chest pressure

This is one of the most obvious signs, for those who are struggling with heart problems will often clutch their chest and complain of discomfort in the area where the heart sits. Technically, the term is called angina, which essentially means that the heart isn’t getting enough oxygen-rich blood.

Shockingly, this signal is often ignored because people mistake it for indigestion. However, unlike indigestion, the consequences of ignoring such a constant pressure in the chest can be catastrophic.