Blood pressure - low

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Effects of age on blood pressure

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Blood pressure - low

Definition:

Low blood pressure is an abnormal conditionin whicha person's blood pressure (the pressure of the blood against the walls of the blood vessels during and after each beat of the heart) is much lower than usual. Itcan cause symptoms such as dizziness or lightheadedness.

Alternative Names:
Hypotension; Low blood pressure
Considerations:

When the blood pressure is too low, there is inadequate blood flow to the heart, brain, and other vital organs.

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A blood pressure level that is borderline low for one person may be normal for another. The most important factor is how the blood pressure changes from the normal condition. Most normal blood pressures fall in the range of 90/60 mm Hg to 130/80 mm Hg, but a significant change, even as little as 20 mm Hg, can cause problems for some people.

Common Causes:

Low blood pressure is commonly caused by drugs such as:

Medications used for surgery
Anti-anxiety agents
Treatment for high blood pressure or coronary heart disease (CHD)
Diuretics
Heart medicines
Some antidepressants
Narcotic analgesics
Alcohol

Other causes of low blood pressure include:

Dehydration
Heart failure
Heart attack
Changes in heart rhythm (arrhythmias)
Fainting
Anaphylaxis (a life-threatening allergic response)
Shock (from severe infection, stroke, anaphylaxis, major trauma, or heart attack)
Advanced diabetes

Another common type of low blood pressure is orthostatic hypotension, which is brought on by a sudden change in body position, usually when shifting from lying down to standingupright.