Conditions that interfere with the parts of the nervous system that regulate blood pressure and heart rate. These conditions include diabetes, alcoholism, malnutrition and amyloidosis (in which waxy protein builds up in the tissues and organs). If you take certain high blood pressure medications, which act on your blood vessels, you may be more likely to suffer from fainting. If you are dehydrated, which may affect the amount of blood in your body and, thus, your blood pressure, you may be more likely to faint.
when you have high blood pressure problems with combination of other heart problems, your blood pressure will change quickly depending upon your position. say you get up too quickly or you lay down and sit up. it will also change depending on the temp of the room like if you went from hot environment to air condition. because of several factors, your blood pressure will change and possibly drop for a few minutes to hours causing lack of oxygen to the brain and feeling faint.
No, fainting is never a normal thing. See a doctor.
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