Most people worry about having high blood pressure. But for some people, low blood pressure (hypotension) is a big worry.
Normal blood pressure is less than 120/80 mmHg. Low blood pressure is generally defined as lower than 90/60 mmHg with symptoms. Having a blood pressure that is too low can mean your vital organs don't get the oxygen and blood they need to work well. Older adults may have symptoms of dizziness and light-headedness when their blood pressure drops lower than usual. But most people with blood pressure in the lower ranges are young and healthy and have no symptoms.
What are the symptoms?
The symptoms of low blood pressure include:
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Dizziness or lightheadedness.
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Confusion.
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Fainting.
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Lack of concentration.
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Blurred vision.
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Headache.
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Nausea.
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Cold, clammy, pale skin.
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Rapid, shallow breathing.
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Tiredness (fatigue).
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Depression.
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Unusual thirst.
Possible causes of low blood pressure include:
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Medicine. This includes medicine for high blood pressure, anxiety, heart problems, Parkinson's disease, erectile dysfunction, prostate conditions, and depression. Other prescription and over-the-counter medicines may cause low blood pressure when taken with medicines for high blood pressure.
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Standing up quickly (orthostatic, or postural hypotension). This is a sudden decrease in blood pressure that happens when you stand up after sitting or lying down. This can cause dizziness, blurred vision, and fainting.
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After eating (postprandial). This is common, especially in older adults and people with diabetes. It usually occurs one to two hours after eating a high-carbohydrate meal. Doctors aren't sure of the cause, but it may be related to the body's response to carbohydrates. Or it may be tied to blood pooling in the digestive tract. Alcohol makes it worse.
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Heart problems. These include a very low heart rate, heart attack, and heart failure.
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Dehydration, shock, advanced diabetes, and thyroid problems
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Genetics. Some people have naturally low blood pressure because of their genes.
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Pregnancy.
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Severe infection.
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Allergic reaction.
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Vasovagal or neurocardiogenic syncope. Low blood pressure can be set off by stressful situations or medicines. This occurs when certain nerves that help control blood pressure lose their tone. This causes fainting.
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Severe anemia. This can be caused by low levels of iron, vitamin B-12, or folic acid.
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Endocrine problems. These can affect the hormones that help control blood pressure.
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Bleeding. Loss of blood can cause low blood pressure. This can be bleeding in the digestive tract or bleeding from injury or trauma.
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Nervous system diseases. These can also affect the autonomic nervous system.
Treatment
Many healthy people who have low blood pressure and no symptoms don't need treatment. Most people with long-term (chronic) low blood pressure who have symptoms can be safely treated with medicine and lifestyle changes. Follow your doctor's instructions.
Actions to help control your low blood pressure may include:
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Drinking more water and even increasing how much salt you have in some cases.
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Taking medicines to raise blood pressure or adjusting medicines that cause low blood pressure as prescribed by your doctor.
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Not drinking alcohol. It can cause dehydration. Alcohol also changes how well medicines work.
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Slowing down. You may be able to reduce lightheadedness by taking it easy when you move from lying down to a standing position. Instead of jumping out of bed in the morning, slowly sit up on the edge before standing. Wiggle your feet and move your legs. This will get your heart rate up and increase circulation.
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Wearing compression stockings if you stand for long periods of time.
