Every heart that cannot provide the required amount of blood for every organ and every part of the body is sick. The most familiar and typical sensation that one feels fallen into such a state is the easy fatigability. This is an indication that there may have occurred some dysfunction of the heart. Fatigability right from the morning that stays through the entire day can be achieved also in reduction of vitamins B9 and B12 to critically low levels described in paragraph "Vitamin Deficiency". If it turns out that the heart is sick then with the disease progress fatigue increases and becomes greater. It begins to be weary yet in less physical effort than usual day after day. For example, when climbing stairs of one or two floors or after lifting a heavy object or when trying to catch a bus.
Another characteristic symptom of the diseased heart is the strong chest pains. They have astringent character without manifesting into a definite location. They are provoked in the same way as the easy fatigability and pass after the physical effort finishes. Their duration lasts between 5 and 30 minutes.
Test for the state of the heart is the sudden emotional stress. Turbulent joy, strong fear and grief cause the most significant release of adrenaline from the adrenal glands which is literally poured into the body. Thanks to it blood pressure suddenly rises, the arteries contract, the heart must work against high resistance, cardiac activity quickens, there is a real risk of occurrence of heart attack or acute heart failure. In about 60% of cases of heart disease pain is not registered.
Most heart attacks are caused by Coronary Artery Disease (CAD). It is caused by a narrowing of the arteries of the heart obtained due to the deposition of atherosclerotic plaques. They limit and reduce more and more passability of the blood vessels. The late occurrence of the disease is due to a physiological phenomenon that pain is felt only when their inner cross-section is narrowed by more than 70%. This makes ischemic disease so insidious because only then one learns that there is suffering that he has carried with himself for many years.