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www.mayoclinic.org/diseases-conditions/low-blood-pressure/symptoms-causes/syc...

A blood pressure reading lower than 90 millimeters of mercury (mm Hg) for the top number (systolic) or 60 mm Hg for the bottom number (diastolic) is generally considered low blood pressure. The causes of low blood pressure can range from dehydration to serious medical disorders.

www.disabled-world.com/calculators-charts/bloodpressurechart.php

Blood pressure table showing if adults and children have high, low, or healthy average blood pressure range for their age, includes other helpful cardiac related information. Key Points: Systolic Pressure is the blood pressure reading when your heart beats. This reading is always the the first or top number.

healthfully.com/dangerously-low-blood-pressure-5535224.html

Experts do not use a specific number to define dangerously low blood pressure 3. Blood pressure that is too low for one person may be normal for another 3. Low blood pressure can be dangerous, according to the Mayo Clinic, if it occurs suddenly or if it causes noticeable symptoms 3.

www.heart.org/.../low-blood-pressure-when-blood-pressure-is-too-low

How low is too low for blood pressure? Within certain limits, the lower your blood pressure reading is, the better. There is also no specific number at which day-to-day blood pressure is considered too low, as long as none of the symptoms of trouble are present.

healthy-ojas.com/lowbp/hypotension-reading.html

Hypotension reading is much harder to quantify; let us see numbers for low blood pressure, too low blood pressure, and dangerously low blood pressure range. Blood pressure is the force of blood pushing against the walls of the arteries as the heart pumps. If this reading is, lower than certain BP range is considering as hypotension reading.

www.everydayhealth.com/hypertension/when-is-low-blood-pressure-too-low

Generally, if the blood pressure reading is under 90/60 mm Hg, it is abnormally low and is referred to as hypotension. Some adults regularly have blood pressure in the hypotensive range but have ...

www.webmd.com/heart/understanding-low-blood-pressure-basics

A blood pressure reading appears as two numbers. The first and higher of the two is a measure of systolic pressure, or the pressure in the arteries when the heart beats and fills them with blood ...

www.medicinenet.com/low_blood_pressure/article.htm

What do the numbers and ranges mean on a blood pressure chart? Low blood pressure or hypotension is a condition in which blood pressure becomes so low that the blood flow to the organs in the body, which causes symptoms like dizziness, fainting, nausea, vomiting, and chest pain. Common causes are heart disease, medications, and dehydration.

www.livestrong.com/article/136527-dangerous-blood-pressure-levels

A blood pressure reading is delivered as a ratio of a top number (systolic blood pressure) and a bottom number (diastolic blood pressure). Both numbers are expressed as millimeters of mercury. The top number references blood pressure when the heart is beating, and the bottom number refers to the pressure when the heart is at rest between beats.

healthtopquestions.com/blood-pressure-how-low-is-dangerous

Blood pressure - How Low Is Dangerous? Blood pressure (BP) is the pressure of circulating blood on the walls of blood vessels. Normal resting blood pressure in an adult is approximately 120 millimeters of mercury (16 kPa) systolic, and 80 millimeters of mercury (11 kPa) diastolic, abbreviated “120/80 mmHg”.