- With Mayo Clinic emeritus hypertension specialist
Sheldon G. Sheps, M.D.
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Sheldon G. Sheps, M.D.
Sheldon G. Sheps, M.D.
Dr. Sheldon Sheps, emeritus professor of medicine and former chair of the Hypertension Division in the Department of Medicine at Mayo Clinic, has been with Mayo Clinic since 1960.
Dr. Sheps, a Winnipeg, Manitoba, native, is board certified in internal medicine and specializes in hypertension and peripheral vascular diseases. He developed a multidisciplinary approach with specially trained nurses, dietitians, technicians and educators to help form a team approach to the treatment of patients with abnormal blood pressure.
"I have always believed in involving the patient and family in their health care," he says. "I have asked for their understanding of the illness and issues and for participation in decisions. The Web is a natural extension of that, and now many more people can be informed."
Dr. Sheps chaired the sixth working group, and participated in the fourth, fifth and seventh groups, that developed the then-latest guidelines for hypertension under the auspices of the National Heart, Lung and Blood Institute (NHLBI). He helped write the latest American Heart Association (AHA) report on blood pressure measurement. He chaired an AHA group that produced an online accreditation for blood pressure measurement for health professionals. He has co-authored books, newsletters, CD-ROMs and other Mayo Clinic health information material and joined Mayo Clinic's Web team in 1998. He was medical editor-in-chief of both editions of the "Mayo Clinic on High Blood Pressure" book; the last edition was published in 2003. He was also medical editor-in-chief of "Mayo Clinic 5 Steps to Controlling High Blood Pressure,'' published in 2008.
He was section editor for each of the first three editions of "Hypertension Primer" for the American Heart Association.
Dr. Sheps was also chairman of the Science Base Subcommittee, National High Blood Pressure Education Program, and was a consultant to the Hypertension Initiative of the World Health Organization. In 1997, he was honored with the Individual Achievement Award on the 25th anniversary of the National High Blood Pressure Education Program of NHLBI. In 2009, he was honored as a Distinguished Mayo Alumnus.
Definition (3)
- Isolated systolic hypertension: A health concern?
- Blood pressure: Is it affected by weather?
- White-coat hypertension: When blood pressure rises at the doctor's office
Risk factors (2)
- Alcohol: Does it affect blood pressure?
- Menopause and high blood pressure: What's the connection?
Symptoms (1)
- Pulse pressure: An indicator of heart health?
Causes (5)
- Blood pressure: Does it have a daily pattern?
- Caffeine: How does it affect blood pressure?
- Blood pressure readings: Why higher at home?
- see all in Causes
Complications (1)
- Hypertensive crisis: What are the symptoms?
Treatments and drugs (5)
- Blood pressure medications: Can they raise my triglycerides?
- Calcium supplements: Do they interfere with blood pressure drugs?
- Diuretics: A cause of low potassium?
- see all in Treatments and drugs
Lifestyle and home remedies (9)
- Water softeners: How much sodium do they add?
- Weightlifting: Bad for your blood pressure?
- Blood pressure medication: Still necessary if I lose weight?
- see all in Lifestyle and home remedies
Alternative medicine (1)
- L-arginine: Does it lower blood pressure?
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Question
Caffeine: How does it affect blood pressure?
How does caffeine affect blood pressure?
Answer
from Sheldon G. Sheps, M.D.
Caffeine is a mild stimulant found in coffee, tea, chocolate and many soft drinks. Too much caffeine can cause nervousness and jitters. It may also increase your blood pressure. The amount of caffeine in two to three cups of coffee can raise systolic pressure 3 to 14 millimeters of mercury (mm Hg) and diastolic pressure 4 to 13 mm Hg in people without high blood pressure.
Among people who don't consume caffeine on a regular basis, caffeine can cause a temporary but sharp rise in blood pressure. Exactly what causes this spike in blood pressure is uncertain. Some researchers suggest that caffeine narrows blood vessels by blocking the effects of adenosine, a hormone that helps keep them widened. Caffeine may also stimulate the adrenal gland to release more cortisol and adrenaline, which cause your blood pressure to increase.
Observational studies can be confusing. Some research has found that people who regularly drink caffeine have a higher average blood pressure than those who drink none. Other research has suggested that regular consumers of caffeine develop a tolerance to it — and as a result, caffeine doesn't have a long-term effect on their blood pressure.
In another twist, a 12-year study of 155,000 women found that drinking caffeinated cola may be associated with an increased risk of high blood pressure. However, the same causal relationship was not found with caffeinated coffee. In fact, the study suggested that women who drink caffeinated coffee may actually have a reduced risk of high blood pressure.
Similarly, a recent (2007) study claims that women who drink six cups of caffeinated coffee a day have lower risks of high blood pressure than do women who drink three or fewer cups daily. The same study found that men and women who never drink coffee also have lower risks of high blood pressure.
As a precaution, some doctors recommend limiting caffeine to 200 milligrams a day — about the same amount as in two 12-ounce cups of brewed coffee. Keep in mind that the amount of caffeine in coffee and soft drinks varies by brand. Also, avoid caffeine right before activities that naturally increase your blood pressure, such as exercise, weightlifting or hard physical labor.
To see if caffeine might be raising your blood pressure, check your blood pressure within 30 minutes of drinking a cup of coffee or another caffeinated beverage you regularly consume. If your blood pressure increases by five to 10 points, you may be sensitive to the blood-pressure-raising effects of caffeine. If you plan to reduce your intake of caffeine, do so gradually over several days to a week to avoid withdrawal headaches.
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