Written by Dr. Valentina Quintana MD on
March 6, 2022
Reading Time: 6 minutes

Medically Reviewed by our Medical Affairs Team

Written by Dr. Valentina Quintana MD on:

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Do you ever feel foggy after drinking your coffee? If so, you’re not alone. Many people report having caffeine brain fog, which can cause problems for people who drink caffeine regularly.

But can caffeine cause brain fog, for real?

In this blog post, we’ll explore the potential causes of caffeine fog and offer some remedies to help you clear your head.

We’ll also discuss how caffeine affects the brain and why it can possibly lead to cognitive problems. 

So, if you’re looking to learn more about caffeine and brain fog, read on!

What exactly is coffee brain fog?

Caffeine fog is often described as a feeling of confusion, mental fatigue, and forgetfulness after drinking coffee or any drink that has too much caffeine in it.

It can be accompanied by other symptoms like headaches, anxiety, and irritability.

For some people, this kind of cognitive fog is simply a side effect of drinking excessive caffeine. But for others, it may be caused by an underlying health condition. 

Caffeine is a stimulant that impacts the central nervous system, and it works by blocking certain receptors in the brain. This increases alertness, improves focus, and enhances mental performance.

But caffeine can also have some unwanted side effects, especially if you drink too much of it.

Excessive caffeine intake can lead to anxiety, restlessness, and insomnia. It can also cause headaches, nausea, and dizziness. 

Can caffeine cause brain fog?

There are many potential causes of caffeine-induced mental fog. As we mentioned, one of them is simply drinking caffeine excessively.

If you’re not used to caffeine or if you drink a lot of it in a short period of time, you may start to feel the effects of caffeine overload. This can include feeling jittery, anxious, or irritable.

You may also start to feel like your thoughts are racing, and it’s hard to focus on anything. This can all lead to feeling foggy-headed and confused.

Another potential cause of caffeine fog is withdrawal. If you’re someone who regularly drinks coffee or other caffeinated beverages, such as energy drinks, and then suddenly stops caffeine consumption, you may experience caffeine withdrawal.

This can cause a number of symptoms like headache, fatigue, difficulty concentrating, and mood swings.

An underlying health condition can also cause caffeine mental fog. If you have a thyroid disorder or another medical condition that affects the brain, you may be more likely to experience caffeine-related cognitive problems.

So, if you’re struggling with caffeine fog, it’s essential to talk to your doctor about possible underlying causes.

Common Symptoms of Caffeine Brain Fog  

If you’re wondering how to tell if caffeine is causing your brain fog, some common symptoms are to look out for. These include the following:

  • Headache
  • Sleepiness
  • Dizziness
  • Nausea
  • Fatigue
  • Lethargy
  • Anxiety
  • Irritability
  • Mood swings
  • Mental lapses
  • Poor concentration
  • Muscle pain, stiffness, cramping 

All of these symptoms can make it difficult to focus and think clearly.

And, if you’re experiencing them regularly, especially after you drink heavily caffeinated drinks or when you’re trying to withdraw from them, it may be a sign that caffeine is causing your brain fog.

Caffeine and Brain Fog: Remedies

If you’re struggling with caffeine fog, there are a few things you can do to alleviate the fog, such as the following:

Lessen your caffeine consumption

If you’re drinking more than 500 mg of caffeine per day, try cutting back by half.

Or, if you’re used to having several caffeinated drinks throughout the day, try switching to just one or two. This will help reduce your caffeine ingestion slowly and may help to lessen the effects of caffeine mental fog. 

Drink caffeine earlier in the day

If you’re struggling with caffeine-induced insomnia and struggling with keeping a healthy sleep cycle, try to drink your caffeinated beverages earlier in the day.

This will give your body time to metabolize the caffeine before you go to bed so that you don’t have trouble sleeping.

Remember that lack of sleep is one of the significant causes of brain fog.

Try caffeine-free options 

If you’re struggling with caffeine induced brain fog, there are a few caffeine-free options that can help.

These include herbal teas, decaffeinated coffee, and sparkling water.

You could also try taking a break from caffeine altogether. This can be difficult at first, but it may help to improve your overall health and well-being.

Lessen your carbs and sugar intake

If you’re eating a lot of processed foods and simple carbs, this can mess up your blood glucose level and contribute to feeling foggy-headed.

Instead, try to focus on eating whole foods like fruits, vegetables, and lean protein. This will help improve your overall health and may also help to clear brain fog instantly.

Drink plenty of water

Dehydration can often cause feelings of fatigue, confusion, and dizziness—all symptoms of brain fog. Make sure to drink plenty of non-caffeinated fluids, especially water, throughout the day.

Consume less alcohol 

If you often drink caffeine and alcohol together, this can make the effects of both substances worse. So, if you’re struggling with caffeine-induced mental fog, it’s important to cut back on your alcohol consumption as well.

Avoid chronic sitting 

Sitting for long periods of time can lead to a number of health problems, including brain fog.

Try to get up and move around every 30 minutes or so. This will help improve your circulation and may also help to clear your head from caffeine fog.


Moderate exercise has been shown to improve mental clarity and focus. So, if you’re feeling caffeine-induced brain fog, try going for a walk, doing some gentle yoga, or taking a bike ride. 

Get enough sleep

Lack of sleep can often lead to feelings of confusion and brain fog. Make sure to get at least seven to eight hours of sleep each night. 

Take breaks during the day

If you’re feeling overwhelmed and caffeine-foggy, take a break. Step away from your work for a few minutes, go for a walk, or drink some water. This can help to clear your head and give you a fresh perspective.

Go outside and get some green time

Spending time in nature has been shown to improve mental clarity and focus. So, if you’re feeling caffeine-induced mental fog, try spending some time outside in the fresh air.

Remove distraction 

When you’re trying to focus, it is extremely helpful to remove distractions.

So, turn off your phone, close your email, and silence any other notifications that might pop up. This will help you focus on the task at hand and improve your mental clarity.


When you’re feeling overwhelmed and caffeine-foggy, sitting down to meditate can be incredibly helpful.

This practice can help clear your mind, improve your focus, and maintain a healthy brain function.

There are a number of different ways to meditate, so find a method that works best for you.

Take brain supplements

There are a few supplements that may help clear caffeine fog and improve overall brain health, such as omega-three fatty acids, vitamin B12, magnesium, Ginkgo Biloba, and Rhodiola Rosea.

You could also try taking a multivitamin to ensure that you’re getting all the nutrients you need.

Seek professional help

If you’re struggling to manage your caffeine input or if you’re experiencing severe side effects, it’s essential to seek professional help.

A qualified health professional can help you create a plan to slowly taper off caffeine and address any other health concerns you may have, especially brain fog.

How does caffeine affect the brain? 

Caffeine is a stimulant that affects the central nervous system.

It can help improve different facets of brain functions, such as mental alertness and focus. However, it can also lead to side effects like anxiety, jitters, and caffeine crash.

Caffeine blocks adenosine, a neurotransmitter that makes you feel tired. It also increases the release of other neurotransmitters like dopamine and norepinephrine, which can lead to increased alertness. 

In some people, caffeine can cause brain fog. This is because it can lead to dehydration, which can cause feelings of confusion and fatigue.

It can also interfere with sleep, which can further contribute to brain fog.

How much caffeine is too much? 

There is no one-size-fits-all answer to this question.

Caffeine sensitivity differs from person to person.

Some people may be able to drink coffee all day without any problems, while others may find that even a tiny amount of caffeine leads to brain fog.

Generally, however, 400 milligrams of caffeine in a day seems to be a safe amount for most adults.

If you’re struggling with caffeine-induced brain fog, it’s important to cut back on your caffeine ingestion and see how your body responds. 

Can overconsumption of caffeine lead to cognitive problems? 

There is some evidence that excessive caffeine intake can lead to several health issues, such as high blood pressure and cognitive problems like memory loss and impaired thinking.

However, more research is needed in this area.

If you’re concerned about the effects of too much caffeine on your cognitive function, it’s important to speak with a healthcare professional.


There are a number of different ways to deal with caffeine-induced brain fog, from making simple changes to your diet and lifestyle to taking supplements or seeking professional help.

No matter what route you choose, it’s essential to be patient and take things one step at a time.

If you want to learn more about brain fog and how to treat it effectively, check out these educational articles and feel free to join this online community of brain health enthusiasts.

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