What are some causes of low blood pressure readings?

A low blood pressure reading may be the result of hypotension, which is chronically low blood pressure, according to the American Heart Association. However, prolonged bed rest, pregnancy, a decrease in blood volume, certain medications and heart problems can also cause low blood pressure readings.

Additional, though less common, reasons for a low blood pressure reading include endocrine problems, severe infection such as septic shock, an allergic reaction and nutritional deficiencies, notes the American Heart Association. If symptoms such as dizziness, fainting, blurred vision, nausea or fatigue accompany consistently low blood pressure readings, it is important to seek immediate medical attention.