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www.reference.com/article/low-blood-pressure-1187ada3b7ccfd23

Low blood pressure, or hypotension, occurs when a person's blood pressure measures below 90 for systolic and 60 for diastolic, according to WebMD. Having just one number below these given figures is enough for a person to have hypotension.

www.reference.com/article/signs-high-blood-pressure-63376d16f1598177

There are normally no signs of high blood pressure, unless blood pressure is checked manually, but someone with extremely high or dangerous blood pressure levels may have irregular heartbeats, dizziness or severe headaches. If someone is feeling these symptoms, it is re...

www.reference.com/article/normal-blood-pressure-men-b43a22fb7845e7ad

According to WebMD, blood pressure in the normal range is classified as 120 over 80. The top number is the systolic and the bottom number is diastolic.

www.reference.com/article/effects-low-blood-pressure-836a3cae2728a987

According to the American Heart Association, effects or symptoms of low blood pressure can include dizziness or lightheadedness; fainting; lack of concentration; blurred vision; dehydration; nausea; cold, clammy skin; shallow, rapid breathing; fatigue and depression. In...

www.reference.com/article/causes-low-blood-pressure-8b231882718e0ca

Dehydration sometimes causes low blood pressure, according to Mayo Clinic. Dehydration can lead to a life-threatening condition known as hypovolemic shock. The low blood volume reduces the oxygen supply to tissues and, if untreated, can cause death. Other causes include...

www.reference.com/article/low-blood-pressure-reading-3c05b4eccd605d64

Most experts define low blood pressure as a reading lower than 90 for systolic pressure and lower than 60 for diastolic pressure, according to Mayo Clinic. Only one of the numbers needs to be in the low range for the overall blood pressure reading to be considered low.

www.reference.com/article/low-blood-pressure-bad-3db04d1845b9c3cc

Low blood pressure, or hypotension, is not normally a cause for concern, unless the individual has other symptoms. Hypotension is classified as any blood pressure rating lower than 90/60.