Feeling even more tired after coffee, getting heart palpitations in the afternoon, or being unable to sleep at night—these may all be related to caffeine. In moderate amounts, caffeine can help you stay alert, but too much may place a burden on the body. This article clearly organizes the caffeine content of common drinks, warning signs of excessive intake, what to do if you have already had too much, and possible alternatives.
CONTENTS
Key Points of This Article
1. Ranking of caffeine content in common beverages
2. 8 major warning signs of too much caffeine
3. Already had too much—what should you do now?
4. Safe drinking recommendations
Sensitive to caffeine but still want to enjoy good tea? Tea usually feels gentler than coffee in terms of caffeine, and choosing the right tea type and brewing method can also help you manage it better.
Choose tea by caffeine level → Ranking of Caffeine Content in Common Beverages
Caffeine is a natural central nervous system stimulant found in coffee, tea, cola, energy drinks, and chocolate beverages. Even for the same cup size, caffeine content can vary greatly—knowing the rough numbers helps you understand how much you are actually consuming each day.
Caffeine content comparison per cup (about 240ml)
The following are common reference values. Actual amounts will still vary depending on the brand, amount of tea leaves, brewing method, and cup size.
For the average adult, total daily caffeine intake is generally recommended to stay below about 300 mg.
Want an energizing drink but worried about too much caffeine? Tea is usually a gentler choice
Lower caffeine
Green Tea Series
About 20mg per cup, with an overall lighter profile
Explore Green Tea Moderate caffeine
Oolong Tea Series
About 25mg, with balanced richness and sweet aftertaste
Explore Oolong Tea Best for alertness
Black Tea Series
Gentler than coffee, but still helpful for staying alert
Explore Black Tea 
8 Major Warning Signs of Too Much Caffeine
If several symptoms appear at the same time, or if the symptoms clearly interfere with daily life, it is recommended to stop taking in more caffeine immediately:
1
Anxiety
It stimulates the central nervous system, increasing feelings of tension and unease.
2
Feeling even more tired the more you drink
Once the effect of caffeine wears off, fatigue can rebound, leaving you more exhausted than before.
3
Insomnia
It can interfere with your sleep rhythm, making it hard to fall asleep or causing early waking during the night.
4
Heart palpitations
The heart rate speeds up, and some people may even feel an irregular heartbeat.
5
Headache
Both excessive intake and sudden withdrawal may trigger headaches.
6
Stomach pain
It can stimulate stomach acid secretion, leading to heartburn or digestive discomfort.
7
Frequent urination
It has a diuretic effect, which increases urination frequency and can make dehydration easier.
8
Diarrhea
It can stimulate intestinal movement and affect digestive stability.
If you are already experiencing palpitations or insomnia, you might consider switching from coffee to cold-brew tea—the overall stimulating effect is usually lower.
View cold brew tea bags → I’ve already had too much caffeine—what should I do now?
If you have had too much today and are already feeling palpitations or anxiety, here is what you can do:
1
Stop consuming more immediately
This includes coffee, tea, energy drinks, and pain relievers that contain caffeine—stop all of them for the moment.
2
Drink more plain water
This helps replenish fluids and makes your overall condition more stable.
3
Take a light walk
Gentle movement may help ease tension, but avoid intense exercise so your heart rate does not climb even higher.
4
Replenish electrolytes
If you have been urinating frequently or sweating a lot, you can pair this with electrolyte drinks or ordinary foods that help replenish them.
5
Wait for it to metabolize (common half-life: about 5–6 hours)
The discomfort usually eases gradually with time; if the palpitations are severe or the discomfort persists, medical attention is recommended.
The positive effects of caffeine on the body
In moderate amounts, caffeine may also bring some positive effects, which is why it is so widely used:
✓
Helps improve alertness and wakefulness
✓
Can improve focus and work efficiency
✓
May help exercise performance in some situations
✓
Related to maintaining everyday wakefulness
Some people feel that tea provides a smoother kind of alertness, but the actual experience still varies depending on individual body response and drinking habits.
Safe drinking recommendations and precautions
For the average adult, daily caffeine intake should be kept below about 300 mg. Pregnant people, young children, and those with cardiovascular or gastrointestinal conditions should avoid it as much as possible or reduce their intake.
Control daily intake
Usually recommended not to exceed about 300mg
Special groups should be careful
Pregnant people, children, people with cardiovascular disease, and those with insomnia should avoid excessive intake
Avoid stacking caffeine sources
If you already had coffee in the morning, try to avoid milk tea or energy drinks later in the afternoon
Choose lower-caffeine alternatives
Sensitive individuals may switch to heavily roasted oolong, cold-brew tea, or herbal tea
Listen to your body’s response
If anxiety or palpitations appear, stop consuming it first, drink water, and observe your condition
Worried about caffeine but still want an energizing drink? Try these
Heavily roasted oolong often feels gentler for many people, and if paired with cold brewing, the overall stimulating effect is usually lower as well. Replacing coffee with tea still lets you keep your daily drinking routine.
Conclusion
Caffeine is a double-edged sword—it can help with alertness in moderate amounts, but excessive intake may cause discomfort. Understanding the approximate caffeine content of different beverages and choosing according to your own physical condition is the safer approach. If you feel that coffee is too stimulating, try tea instead—it can also help you stay alert, but offers more variety and is easier to adjust to your needs.
FREQUENTLY ASKED
Frequently Asked Questions
Q Which drinks contain caffeine?
Coffee, matcha, milk tea, oolong tea, green tea, black tea, cola, energy drinks, and chocolate beverages all contain caffeine. Tea usually has a gentler caffeine profile than coffee, making it a common alternative for those who want to reduce intake.
Q What are the warning signs of too much caffeine?
Anxiety, rebound fatigue, insomnia, palpitations, headache, stomach pain, frequent urination, and diarrhea are all common symptoms. If several discomforts appear at the same time, it is recommended to stop consuming more and drink water.
Q What is the recommended daily intake?
For the average adult, it is usually recommended not to exceed about 300 milligrams. For pregnant people and children, the recommended amount is lower, and professional medical advice may be helpful when needed.
Q What are the benefits of moderate caffeine consumption?
Moderate caffeine is often used to help improve alertness, focus, and everyday wakefulness. The actual effect still varies depending on the individual and when it is consumed.
Q What can caffeine-sensitive people drink?
You can choose heavily roasted oolong tea, cold-brew tea, or herbal tea. For many people, these are relatively gentler options.
GENTLE ENERGY, REAL FLAVOR
Replace coffee with tea for gentler, easier-to-manage alertness
BESTEA carefully selects a variety of Taiwanese teas, from lower-caffeine green tea to mellow black tea—there is always one that fits your daily routine.
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