“Normal” blood pressure is lower than 120/80 mm Hg. Although there’s no definite cut-off, 90/60 mm Hg or lower is often considered low blood pressure.

Some people naturally have low blood pressure, and it doesn’t present a problem. But if low blood pressure causes symptoms or you have sudden drops in blood pressure, it’s important to address it.

A person with low blood pressure may have:

• Dizziness
• Light-headedness
• Nausea
• Blurred vision
• Trouble concentrating
• Brief losses of consciousness (fainting)

What Causes It?
Several things can cause blood pressure to drop too low, including:

• Being dehydrated
• Heart problems that hamper blood circulation
• Thyroid and other gland problems
• Medications, such as diuretics, beta-blockers, tricyclic antidepressants, drugs used to treat erectile dysfunction, and drugs for Parkinson’s disease

Take It Easy
Low blood pressure can also be caused by changes in the nervous system that make it harder for blood vessels to contract and relax normally. This can lead to a type of low blood pressure called orthostatic hypotension that occurs when you stand up. People with it should follow the “slow-and-go rule” (see “Slow and Go!” below).

If you have symptoms of low blood pressure, it’s a good idea to see your doctor. Before going, jot down your symptoms. Also note what you were doing when they occurred, such as taking a hot bath or standing up suddenly. Bring along a current medication list, too. All that information will help your doctor diagnose the problem.

Slow and Go!
If you feel light-headed or dizzy when you stand up, you may have orthostatic hypotension. Be sure to follow this “slow-and-go” rule.

• When getting out of bed, first sit on the edge of the bed for a moment.
• Point your toes, then flex them (stretch the toes up and back). Repeat this 10 times.
• Stand up.
• Count to 10 before walking.

Quiz Yourself on Low Blood Pressure
See what you know about low blood pressure with an online quiz by clicking here.