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How Does Caffeine Affect Blood Pressure

Does Coffee Raise Blood Pressure


As a stimulant, coffee makes people more alert and awake. Over 154 million adults, or 75% of the US population, are reported to consume some form of it every day. Due to its popularity, there needs to be a better understanding of how it can impact your health. Experts agree that in moderation coffee is not unhealthy, but how does it affect your blood pressure?

Will Caffeine Cause Blood Pressure To Rise

Yes, caffeine can raise blood pressure and its important to limit caffeine intake if you want to maintain healthy blood pressure levels.

But reducing caffeine isnt the only way to lower blood pressure regular exercise and eating a healthy diet are also effective at helping you maintain good blood pressure.

How Coffee Affects Blood Pressure Readings

A blood pressure reading consists of two numbers, each of which measures the pressure against your arteries as your blood is moving through them systolic blood pressure is the reading when your heart beats, and diastolic blood pressure is the reading between beats. According to the CDC, a normal blood pressure reading falls under a systolic reading of 120 and a diastolic reading of 80.

Coffee and other caffeinated beverages cause the muscles of the arterial walls to tighten and the blood vessels’ diameter to decreasea process called vasoconstrictionwhich raises blood pressure, notes cardiologist Dr. Seamus Whelton of Johns Hopkins Medicine. But studies have shown that blood pressure spikes from coffee last only a few hours. Habitual coffee drinkers likely develop a tolerance. In fact, one study showed that after two weeks of drinking coffee, the blood pressure increase had vanished. However, says Dr. Whelton, if you are keeping a close watch on your blood pressure, you should refrain from caffeine for at least half an hour before taking your readings.

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Staying On Top Of Your Health

Monitoring your blood pressure is important to ensure that your heart is healthy, whether you regularly drink coffee or not. With QardioArm, you can monitor your blood pressure wherever and whenever. It is completely wireless and connects to a state-of-the-art app. QardioArm is ideal for anyone looking for an efficient, practical way to monitor their blood pressure.

Should People Taking High Blood Pressure Medicine Avoid Caffeine

Caffeine &  Hypertension  Caffeine Drinks Raise Blood Pressure

Many people ingest caffeine on a daily basis, whether through coffee, tea or soft drinks. Energy drinks, chocolate and some medications may also be sources of caffeine. While this habit may not create any problems for most people, caffeine can have an impact on your blood pressure.

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Circulatory And Respiratory Systems

Caffeine is absorbed from your stomach. It reaches its highest levels in your bloodstream within an hour or two.

Caffeine can make your blood pressure go up for a short time. This effect is thought to be attributed to either an increase in adrenaline or a temporary block on the hormones that naturally widen your arteries. In most people, there is no long-term effect on blood pressure, but if you have irregular heart rhythms, caffeine may make your heart work harder. If you have high blood pressure or heart-related problems, ask your doctor if caffeine is safe for you to consume.

An overdose of caffeine may cause rapid or irregular heartbeat and breathing trouble. In rare cases, caffeine overdose can result in death due to convulsions or irregular heartbeat.

Caffeine in large amounts may interfere with absorption and metabolism of calcium. This can contribute to bone thinning .If you consume too much, caffeine may cause also your muscles to twitch.

If experiencing caffeine withdrawal, a symptom may include achy muscles.

What To Eat To Lower Your Blood Pressure

Rolled oats

A review with five research trials included tested the impact of oats on systolic blood pressure and diastolic blood pressure in about 400 healthy adults.

The researchers found that systolic blood pressure was 2.7 mmHg lower and diastolic blood pressure was 1.5 mmHg lower when participants ate around 60 grams of rolled oats or 25 grams of oat bran per day.

This quantity of oats or oat bran contains around four grams of a type of fibre called beta-glucan.

For each extra one gram of total daily fibre, there was an extra 0.11 mmHg reduction in diastolic blood pressure.

Recommended minimum daily adult fibre intakes are 30 grams for men and 25 grams for women.

While some of fibres effect is due to weight loss, soluble fibres produce bioactive products when theyre fermented in the large bowel. These work directly to lower blood pressure.

To improve your blood pressure, eat rolled oats or oat bran for breakfast, add to meat patties, or mix with breadcrumbs in recipes that call for crumbing.


Beetroot is extremely rich in a compound called inorganic nitrate. During digestion, this gets converted into nitric oxide, which causes arteries to dilate. This directly lowers the pressure in them.

A review of 16 trials of mostly healthy young men found drinking beetroot juice was associated with a 4.4 mmHg reduction in systolic blood pressure. But it found no change in diastolic blood pressure.

Vitamin C

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Caffeine’s Effect On Blood Pressure

May 17, 2002 — The caffeine jolt of a java fix may cause a jump in blood pressure — a particular problem in people who already have high blood pressure. But don’t put your coffee cup down just yet. Researchers say the jury’s still out on the effects on caffeine on your heart.

This new study was presented today at the annual scientific meeting of the American Society of Hypertension in New York City.

Although there has been a lot of recent interest in studying how caffeine may affect the heart and blood pressure, the authors say it’s the first time an effect of caffeine has been found on the stiffness of arteries, an indicator of heart function.

In the study, caffeine quickly increased the stiffness of the large arteries in people with high blood pressure, said study author Charalambos Vlachopoulos, MD, of the department of cardiology at Athens Medical School in Greece, at a news conference.

Vlachopoulos and colleagues tested the effects of caffeine on the major arteries of 10 people who were being treated for high blood pressure and were an average of 62 years old. On alternating days, the participants were given either a pill containing 250 mg of caffeine or a placebo.

Thirty minutes after the caffeine was given, there was a big jump in the stiffness of their arteries, said Vlachopoulos. The effect peaked after 60 minutes and remained significant for at least three hours.

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Caffeine Blood Pressure And The Heart

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Evidence has repeatedly shown that consumption of caffeine does not increase the risk of high blood pressure, heart disease, or heart attack. One very well-known study examined more than 85,000 women over a ten-year period and found that there was no increased risk of these diseases, even in women who drank more than six cups of coffee per day. The Joint National Committee on Hypertension has specifically stated that there is no evidence linking coffee/tea and high blood pressure.

While some studies have shown a weak link between caffeine and elevations in blood pressure, the results are complicated and only consider short-term effects.

For example, one widely quoted study found that blood pressure rose slightly in subjects almost immediately after consuming a caffeinated beverage and that this blood pressure rise was more pronounced in people with pre-existing high blood pressure. However, these elevations were not very large and only lasted a short time. The study also showed that in about 15 percent of people with existing high blood pressure, drinking a caffeinated beverage actually caused a decrease in blood pressure.

Two important studies published in 2007 further supported the existing body of evidence by again demonstrating that:

  • Caffeine-induced blood pressure changes were small and short-lived
  • Caffeine does not contribute to disorders of the blood vessels associated with high blood pressure and cardiovascular disease

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Effect Of Caffeine On Bp

BP increased significantly following caffeine intake as compared to placebo . Pairwise contrasts of the change in BP after caffeine as compared to the change in BP after placebo revealed significant increases in SBP after caffeine compared to placebo in all 6 groups . The DBP change after caffeine was significant in all groups except in the young men . There were no significant differences in BP responses by HRT status, nor were there significant differences in HR responses to caffeine by group. Results of the repeated measures ANOVAs are displayed in . To distinguish the effects of age from that of hormonal status, we adjusted for age in the repeated measures analyses. There was no significant interaction effect of age with drug or week on SBP, DBP, or HR.

Change in blood pressure and heart rate in response to caffeine and placebo administration. BP, blood pressure C, caffeine P, placebo PRE, premenopausal women ERT, postmenopausal women taking estrogen therapy HRT, postmenopausal women taking estrogen and progesterone therapy NHRT, postmenopausal women not taking hormone replacement YM, young men OM, older men BPM, beats per minute.

*Significant difference from placebo responses per week, p< 0.05.

What Can I Do If Im Concerned About Caffeine And High Blood Pressure

If you are at all concerned about how your caffeine habit may be affecting your heart, here are a few things you can do to help ease your mind:

To sum it up: In most cases, a cup or two of your favorite caffeinated beverage in the morning wont cause any harm. Unless your doctor told you to specifically avoid it, its not something you should lose sleep over. The high blood pressure that comes right after drinking caffeine is temporary and wont make you any more likely to develop hypertension later in life.

Now, if youll excuse me, I need to finish my large, iced, French vanilla coffee.

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What Is The Best Time For Caffeine Consumption

It is advisable to consume caffeine at least an hour after waking up, with mid to late morning being considered to be the most suitable time for caffeine consumption.

This is because your cortisol levels are highest during the initial 30 to 45 minutes of waking up and decrease through the rest of the day. Consuming caffeine early in the morning may not be as beneficial as consuming it during the daytime as your cortisol levels may alter the energising effects of caffeine.

Consuming a caffeinated beverage about 30 to 60 minutes before a workout or sporting event can help optimise caffeines beneficial effects on exercise performance.

Further, the stimulating effects of caffeine last for about 3 to 5 hours. Thus, consuming caffeine too close to bedtime can cause sleeping problems. You should avoid caffeine consumption at least 3 to 5 hours before going to bed.

Negative Effects Of Caffeine

Low Blood Pressure &  Caffeine

Caffeine can have a disruptive effect on your sleep. The most obvious effect of the stimulant is that it can make it hard for you to fall asleep. One study also found that caffeine can delay the timing of your body clock. These effects will reduce your total sleep time. Caffeine also can reduce the amount of deep sleep that you enjoy.

The effects of caffeine can occur even when you consume it earlier in the afternoon or evening. One study found that consuming caffeine 6 hours before bedtime reduced total sleep time by 1 hour. These effects also can be stronger in older adults. It takes their bodies a longer time to process caffeine. Regularly consuming high doses of caffeine may cause complications during pregnancy.

At high doses, caffeine can produce these common side effects:

  • Diarrhea
  • Increased breathing rate
  • Muscle tremors

Withdrawal symptoms can occur when you stop taking caffeine after using it regularly for a long time. These symptoms include:

  • Headaches
  • Low energy levels
  • Bad moods

The FDA is collecting reports of adverse events that have occurred in people who took products marketed as energy drinks or energy shots. The FDA cautions consumers that products marketed as energy shots or energy drinks are not alternatives to sleep.

Caffeine powder is highly potent, and a safe serving size is extremely small. It is nearly impossible to measure caffeine powder accurately in the home. As a result the risk of an accidental, lethal overdose is high.

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What Does Caffeine Do To Your Blood Pressure

5 min read

This is perhaps one of the common questions among java lovers and coffee noobs alike.

Many people know the effects of caffeine on the body. Some of them are positive, like added concentration and stronger mental performance, alertness and awake-ness, healthy glowing skin, boost in metabolism, and a happy disposition.

But going overboard with your caffeine fix could sometimes lead to adverse effects, including jitters, anxiety, and palpitations.

And this leads some people to ask whether caffeine also raises blood pressure.

This is an important question because 80 percent of Americans drink coffee every day and about 90 percent of people worldwide consume caffeine in one product or another. More importantly, high blood pressure can cause strokes or heart attacks.

So whats the verdict?

The jurys pretty much out on this one.

How Does Caffeine Affect Your Heart

You wake up and brew yourself a pot of coffee. As you sit to read the morning news, you start sipping, getting ready to start the day. Later in the afternoon, you feel the post-lunch slump, so you drive to the nearest coffee shop for a pick-me-up espresso or latte. But have you ever wondered how the caffeine in all this coffee affects your body more specifically, your heart? Lets break it down.

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How To Reduce The Effects Of Caffeine On Blood Pressure Without Drinking Less Coffee

If you drink a lot of coffee and have high blood pressure then its likely youre going to need to drink less coffee. But there are other things you can do to try to reduce the effect of caffeine in blood pressure.

This is because the effect of caffeine intake may be exacerbated by other substances or activities which also increase your blood pressure. So:

Avoid caffeine before doing exercise or any highly energetic activity hard labour, workouts, runs, brisk walks. These already raise your blood pressure, and the extra effect of caffeine can mean your heart has to work too hard. Stay away from caffeine for at least an hour before getting into it drink water instead.

Dont smoke and drink coffee tobacco also raises blood pressure by constricting your blood vessels, so coffee and a cigarette arent such a perfect combination for your blood pressure!

Should People With Hypertension Avoid Coffee

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A 2017 review concluded that people with high blood pressure should exercise some caution when drinking coffee but do not need to avoid it.

The review found that although there were older reports of a link between coffee drinking and hypertension, more recent studies suggested that 34 cups a day had either a neutral or beneficial effect.

A of 40 healthy regular coffee drinkers found that all types of coffee increased blood pressure but that the levels stayed within healthy ranges.

The increase in blood pressure was temporary but still measurable after consumption.

Some research suggests that the amount of coffee that someone drinks determines its effects on blood pressure.

As coffee contains many different compounds aside from caffeine, other compounds could be responsible for its effects on blood pressure.

However, a person could try switching to decaffeinated coffee to see whether their blood pressure decreases.

Some people find drinking coffee causes insomnia, anxiety, or tremors. Others may notice reflux and heartburn. Anyone who experiences these symptoms due to coffee should avoid drinking it.

According to researchers , regular coffee drinkers may experience withdrawal symptoms, such as headaches and low mood, if they suddenly stop consuming it. Therefore, if they wish to reduce their consumption, they should cut down the number of cups gradually.

Some alternatives to coffee contain caffeine, while others are naturally caffeine-free. People can try:

  • chicory coffee

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How Can You Bring Your Blood Pressure Down Quickly

Here are some simple recommendations: Exercise most days of the week. Exercise is the most effective way to lower your blood pressure. Consume a low-sodium diet. Too much sodium causes blood pressure to rise. Limit alcohol intake to no more than 1 to 2 drinks per day. Make stress reduction a priority.

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How Much Caffeine Should I Have

Many sources recommend limiting your caffeine intake to 200mg caffeine per day. This is roughly the equivalent of two 12 ounce cups of brewed coffee per day.

However, there are other factors to consider when figuring out what amount will suit you:

Personal Physiology

In general, the smaller and lighter you are, the more caffeine is likely to affect you. So you youll probably need to stick to a lower daily caffeine limit than 200mg.

At the other end of the scale, if you are overweight, caffeine is likely to have a greater effect on your blood pressure. So you will also need to keep to a lower daily caffeine intake.


Also, the older you get the more your blood pressure is likely to react to caffeine. This is especially the case once youre over 70 or so.

Find out for yourself how caffeine affects your blood pressure

To get a rough idea how much caffeine may affect your blood pressure, check your blood pressure.

Do a blood pressure reading before drinking caffeine, then 30-60 minutes after drinking caffeine. If its 5-10 points higher, then you are likely to be sensitive to it.

If you dont yet have a blood pressure monitor of your own then its a good idea to get one. Read more about that in our article here: do I need a blood pressure monitor?

But what if I have a good tolerance for caffeine?

So, however little you feel it affects you, better to be safe than sorry and cut down the caffeine.

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