And why do most people who have heart attacks have never felt a warning sign? The fact is that until the damage has progressed to dangerous levels,

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An artery has to be 75% to 80% occluded before the person has any awareness of a problem.This is largely because the body does not depend on any single artery to do the job. Most parts of the body have two or three alternate vessels that can be presses into service if one of them becomes clogged. Sometimes the pain blamed on something else such as digestive upsets for instance.

The first symptoms of the disease are:

SYMPTOMS

The reason the pain or discomfort can be unpredictable it that the heart itself does not feel pain; it does not have specific pain fibres. The heart's nerves do not feel pain directly. So, when something is going wrong with the heart, its nerves become electrically unstable.

Then when theses nerves cross the spinal column, they may short-circuit other nerves; nerves that connect with your arm, or your chest, for example.

The brain sometimes also joins the action by stimulation the vagus nerve to cause stomach upset and a cold sweat. Needless to say that if these nerve fibers do not cross, you won't have nay discomfort, even while having a heart attack. That is why so many people don't know they are having a heart attack.

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