Top 3 Bad Effects of Caffeine | Visualized Health

Reviewed by The Clinical Committee

July 13, 2019

  • Caffeine has some negative effects for individuals with specific conditions.

  • It may increase the risk of migraines, increase anxiety for those with an anxiety disorder, and increase blood pressure.

  • However for the general public, there is still little reason to suspect that caffeine is unsafe.


In general, we believe that the research shows that caffeine is pretty good for you. There are a lot more positive effects than negative effects.

But, any substance taken in high amounts is going to have some negative effects for some people. Even drinking too much water can be bad for you.

Below are the most well-validated negative effects of caffeine that we have seen so far. In general, these mostly applied to patients with specific conditions, who should consider reducing their caffeine intake if it causes them to have symptoms.

Top 3 Bad Effects of Caffeine



One study suggest that caffeine may increase anxiety in the short term particularly for patients with an anxiety disorder. They found that those patients who already had an anxiety disorder had more symptoms of caffeine, including more sweating and a higher blood pressure.

Reference: Arch Gen Psychiatry.

"Caffeine produced significantly less decrease in electroencephalographic alpha wave activity, greater decrease in N1-P2 auditory evoked potential amplitude, and greater increased in skin conductance level, systolic and diastolic blood pressure, critical fusion flicker frequency, and self-ratings of anxiety and sweating in patients with GAD than in normal patients...It is concluded that patients with GAD are abnormally sensitive to caffeine and that the data support the view that panic disorder is a separable disorder from GAD."



Caffeine intake was found to correlate strongly with chronic migraines and and daily headaches. Patients who drank more caffeine were more likely to develop chronic migraines severe enough to require large amounts of pain medications.

Reference: Headache Journal

"When the active groups were compared with the episodic migraine group, the following associa-tions were found: 1) ARH: hypertension and daily consumption of caffeine; 2) CM: allergies, asthma, hypothy-roidism, hypertension, and daily consumption of caffeine; and 3) NDPH: allergies, asthma, hypothyroidism, andconsumption of alcohol more than three times per week."


Blood Pressure

Researchers found that in general, those who drank a lot more caffeine may have a slightly higher blood pressure. This was after looking through 18 trails with coffer and 7 trials with caffeine. The effects were relatively small, all less than five blood pressure points, but they were significant. As with any such study, the correlation doesn’t mean the caffeine causes higher blood pressure.

Reference: J Hypertens.

"A significant rise of 2.04 mmHg in systolic BP and 0.73 mmHg (95% CI, 0.14-1.31) in diastolic BP was found after pooling of coffee and caffeine trials. When coffee trials (n = 18, median intake: 725 ml/day) and caffeine trials (n = 7, median dose: 410 mg/day) were analysed separately, BP elevations appeared to be larger for caffeine than for coffee . Effects on HR were negligible."

More Information on Caffeine

Keys to Health

If you have migraine headaches, high blood pressure, or an anxiety disorder, you may want to think about cutting back on your coffee intake if it is causing you to have symptoms.

If you don’t have any of the above conditions or any similar symptoms, then drinking coffee or tea in moderation should be pretty good for you.

Questions on #antioxidants
Can antioxidants protect your vision?Can antioxidants supercharge your brain power?Can taking antioxidants protect you against cancer?
Explore More
thumbnail for covid-depression
thumbnail for nap-heart
thumbnail for honey-cough
thumbnail for chemotherapy-social
thumbnail for sleep-disparity
thumbnail for covid-eatingdisorder
thumbnail for caffeine-pregnancy
thumbnail for eczema-bone
thumbnail for breastfeeding-diabetes
thumbnail for schizophrenia-autoimmune
thumbnail for gender-ami
thumbnail for ptsd-ovarian
thumbnail for vaccine-distrust
thumbnail for covid-heartattack
thumbnail for covid-eye
thumbnail for heat-health
thumbnail for sleepstroke-disparity
thumbnail for coffee-depression
thumbnail for cannabis-depression
thumbnail for music-surgery
thumbnail for bath-heart
thumbnail for diabetes-mental
thumbnail for coffee-filter