Generally feeling weak
It may appear desirable for some people to have low blood pressure and it does not cause any problems. However, an abnormally low pressure (hypotension) can cause many people’s dizziness and fainting. Low blood pressure can endanger life in severe cases. In general, blood pressure less than 90 mm of mercury (mm Hg) is considered to be low in the systolic) and 60 mm Hg in the diastolic of the blood. Low blood pressure can be caused by dehydration and severe medical or operating disorders. It is important to know what causes your low blood pressure to treat it.