Blood pressure refers to the force of blood pushing against artery walls as it courses through the body. A blood pressure reading appears as two numbers. The first and higher of the two is a measure of systolic pressure, or the peak force of blood as it is actually being pumped by the heart. The second number measures diastolic pressure, or the force of blood when the heart is filling for the next beat. Normal blood pressure rises steadily from about 90/60 at birth to about 120/80 in a healthy adult. A reading that shows 110/70 or below can be determined as low blood pressure.

Symptoms of low blood pressure may include dizziness, headache, tiredness and dizziness as soon as one gets up from a lying down position.