Caffeine and Blood Pressure: Does One Affect the Other?

If you frequently drink caffeine or have high blood pressure, you’ve probably wondered how caffeine and blood pressure are connected – and if enjoying your favorite caffeinated beverage can contribute to hypertension. While caffeine may cause temporary spikes in blood pressure, moderate intake is generally safe for most healthy adults, though the impact can vary from person to person. 

In this article, we’ll take a closer look at how caffeine affects blood pressure, what your daily caffeine intake should be, who should limit caffeine consumption, and lastly, which foods and drinks are high in caffeine. 

If you have concerns about how caffeine intake might be affecting your blood pressure, we encourage you to contact us. Because there are often no obvious signs of high blood pressure, the only way to know for sure if you have it is to get it checked regularly. At Raleigh Medical Group, our expert internal medicine physicians can evaluate your blood pressure and guide you on the next best steps for managing your health and reducing long-term risks. 

How Does Caffeine Affect Blood Pressure?

As previously mentioned, caffeine can lead to a temporary increase in blood pressure, though the effect varies depending on the individual. Moderate caffeine intake is not linked to long-term hypertension in most adults; however, it can have a greater impact on those with existing high blood pressure or those who drink it infrequently. 

Blood pressure may increase by as much as 5–10 mmHg after drinking coffee. For some people, this can elevate blood pressure from the “normal” to the “high” range.  This blood pressure spike may occur within 30 – 120 minutes after consuming caffeine and last for 3 – 4 hours before returning to normal.

Here’s what happens in your body when you consume caffeine:

• Blood vessels narrow slightly
• Adrenaline levels increase
• Your heart works harder temporarily

This combination is what elevates blood pressure in the short term. 

Factors that may impact caffeine’s effects include:

• Genetics, i.e., your genes influence how your liver processes caffeine
• Age, for example, children and older adults are typically more sensitive to caffeine
• How much caffeine you regularly consume and how frequently you consume it 
• Medications and other substances, such as nicotine 
• Pre-existing hypertension or other health conditions
• Stress levels
• Sleep quality

Regular coffee drinkers may build caffeine tolerance and experience smaller spikes in blood pressure over time.

What Should Your Daily Caffeine Intake Be?

It’s safe for most healthy adults to consume up to 400 mg of caffeine per day. 

400 mg is the equivalent of around four 8-ounce cups of brewed coffee, several caffeinated sodas or roughly two energy drinks. 

Estimated caffeine amounts per drink:

• Brewed coffee: 80–100 mg for one 8-ounce cup
• Energy drinks: 100–300, + mg
• Black tea: 40–70 mg
• Soda: 30–50 mg

Keep in mind that caffeine content can vary significantly by brand, product and serving size.  Some beverages such as cold brew or concentrated energy drinks may contain caffeine amounts in excess of those mentioned above. 

You should be especially cautious with energy drinks because, in addition to high caffeine levels, they often contain added sugar and stimulants. 

If you consume too much caffeine, you may experience:

• Jitters
• Anxiety
• Headaches 
• Rapid heartbeat
• Difficulty sleeping 
• Temporarily elevated blood pressure

Who Should Limit Their Caffeine Intake? 

While consuming a moderate amount of caffeine is safe for many adults, certain people should monitor their caffeine intake more carefully. 

Those with greater sensitivity to caffeine or at higher risk of complications include:

• People with high blood pressure
• Lactating and pregnant women
• Children and adolescents 
• People with anxiety disorders
• People with underlying heart conditions such as arrhythmias, heart palpitations or cardiovascular disease 
• People taking blood pressure medication, certain stimulants or other medications that can interact negatively with caffeine 

If you are in any of the groups above or if you’re experiencing adverse side effects from caffeine, we encourage you to speak with us for personalized guidance about what’s safe.

As we noted previously, energy drinks can be especially problematic because they often contain excessive caffeine, added sugar and stimulants. Drinking multiple energy drinks per day can increase health risks more than regular coffee or tea. 

What Drinks and Foods Are High in Caffeine?

While many people consider coffee the main source of caffeine, it can also be found in other foods and beverages.

Common sources of caffeine include:

• Brewed coffee, espresso, cold brew beverages and iced coffee
• Soda and other soft drinks, especially colas
• Black tea, green tea and matcha 
• Energy drinks 

Caffeine can also be found in:

• Dark chocolate 
• Cocoa products
• Coffee-flavored ice cream or yogurt
• Energy snacks 

Caffeine is sometimes added to headache medications and energy or workout supplements as well. Long-term use of over-the-counter headache medications like Advil and Aleve can also impact kidney health and raise blood pressure.

Let Our Expert Internal Medicine Physicians at Raleigh Medical Group Guide You in Living Your Healthiest Life 

Though moderate caffeine intake is considered safe for most healthy adults, certain groups need to exercise greater caution, such as those with existing high blood pressure. Caffeine doesn’t affect everyone the same way, so it’s important to understand your body’s reaction and sensitivity level and proceed accordingly. 

At Raleigh Medical Group, we’ve been supporting Raleigh residents with effective treatment for hypertension and other health conditions for more than 25 years. Our internal medicine physicians can gauge what level of caffeine intake may be safe for you, while helping you maintain healthy blood pressure.

We invite you to contact us today.