Brain Fog in POTS and Dysautonomia: Explanation and How to Cope

Why Can't I Think Clearly? Understanding Brain Fog in POTS and Dysautonomia

Have you ever walked into a room and forgotten why you went there, struggled to find the right word, or read the same sentence several times without taking it in? This kind of mental sluggishness is often called brain fog, and it can be a frustrating part of living with POTS or another form of dysautonomia.



Brain fog can make everyday tasks feel harder than they should. You may have trouble concentrating, remembering information, making decisions, or keeping up with a conversation. For some people, these symptoms become more noticeable when they are standing, tired, dehydrated, overheated, or experiencing a flare of other POTS symptoms.

So, why does dysautonomia affect the way you think? Understanding the connection between the autonomic nervous system, blood flow, fatigue, and brain function can help explain why these symptoms happen and what may make them worse.

Why Does POTS Cause Brain Fog?

POTS can cause brain fog because the condition affects how your body regulates blood flow when you are upright. When you stand, gravity pulls blood toward your lower body. A healthy autonomic nervous system responds by adjusting your heart rate and blood vessels to keep enough blood circulating to the brain.

With POTS, this response does not work normally. Your heart rate may rise significantly when you stand, while blood can pool in your legs and abdomen. Changes in blood flow to the brain, combined with the physical strain of maintaining circulation, may contribute to problems with concentration, memory, and mental clarity.

Several factors can make this worse:

Reduced Blood Flow to the Brain

For many people with POTS, having less blood flowing to the brain while standing is common. The changes in blood flow may cause dizziness and make it harder to think clearly.

Increased Heart Rate and Physical Stress

One of POTS' main characteristics is that it causes a rapid heart rate. Your body may work harder to maintain adequate circulation while you are upright. This can leave you feeling physically and mentally drained, making it harder to focus on demanding tasks.

Autonomic Nervous System Activation

POTS affects how the body controls automatic functions like heart rate and blood flow. When you stand, your body may work harder to keep blood flowing properly. This can trigger a fight-or-flight response, causing a fast heartbeat, shakiness, feeling on edge, and trouble concentrating.

Dehydration and Low Blood Volume

Not having enough fluid in your body can make orthostatic symptoms worse. Some people with POTS also have lower circulating blood volume, especially in the morning.

Together, these factors can make it more difficult for your body to maintain effective circulation when you stand, potentially worsening brain fog.

Brain Fog and Dysautonomia

POTS is one type of dysautonomia. Dysautonomia is a group of conditions that affect the autonomic nervous system. Brain fog can also occur with other forms of dysautonomia, not just POTS.

When the autonomic nervous system does not work properly, it causes changes in blood flow, fatigue, and poor sleep, among other things. These can make it harder to think clearly. You may have trouble focusing, remembering things, finding the right words, or processing information.



The exact cause of brain fog can vary depending on the type of dysautonomia and the person. Symptoms may also become worse during a flare or when you are tired, dehydrated, overheated, or standing for a long time.

How Can You Manage Brain Fog?

There are several simple ways to make brain fog easier to manage. Try the following:

Stay Hydrated

Drink enough fluids throughout the day. Dehydration can make POTS symptoms worse and may add to fatigue and brain fog.

Pace Physical Activity

Avoid doing too much at once, especially on days when your symptoms are worse. Take breaks and give your body time to recover.

Plan Around Your Best Times

Notice when you feel most alert and try to do tasks that require more focus during those times. Save easier tasks for when your energy is lower.

Reduce Cognitive Overload

When brain fog is strong, focus on one task at a time. Use notes, reminders, and lists to help you remember things instead of trying to keep everything in your head.

POTS and Dysautonomia Support in Melbourne and Online

If you are searching:

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I offer chiropractic neurological consultations:

• Face-to-face in Melbourne

• Online across Australia

• Online worldwide

If brain fog is making it harder to work, study, or manage everyday tasks, I invite you to book a consultation.

Your symptoms are real. Understanding how your nervous system may be responding can be an important step toward finding the right support.

Frequently Asked Questions

Can POTS brain fog affect memory?

Yes. You may have trouble recalling names, information, or what you were about to do. This does not necessarily mean you have a memory disorder.

Is POTS brain fog permanent?

No. Brain fog can come and go. It may improve when POTS symptoms are better controlled, although some people experience it more often than others.

When should brain fog be checked by a doctor?

Talk to a healthcare professional if brain fog is new, severe, getting worse, or affecting your daily life. Sudden confusion, trouble speaking, weakness, or other sudden neurological symptoms need urgent medical attention.

Research Articles

Raj SR, et al. Cognitive dysfunction in postural tachycardia syndrome. Autonomic Neuroscience. 2018;215:46-55. 

Joyner MJ, et al. Cognitive dysfunction in postural tachycardia syndrome. Clinical Science. 2014;127(8):493-501. 

Wells R, et al. Brain fog in postural tachycardia syndrome: An objective cerebral blood flow and neurocognitive analysis. Journal of Arrhythmia. 2020;36(3):549-552. 

Arnold AC, et al. Cerebral Blood Flow and Cognitive Performance in Postural Tachycardia Syndrome: Insights from Sustained Cognitive Stress Test. Journal of the American Heart Association. 2021;10:e019568. 

Novel brain SPECT imaging unravels abnormal cerebral perfusion in patients with postural orthostatic tachycardia syndrome and cognitive dysfunction. Scientific Reports. 2025;15:3487. 

Malik V, et al. Brain tissue changes, network dysfunction, and cerebral hemodynamic deficits in postural orthostatic tachycardia syndrome. Heart Rhythm. 2026;23(8):e1617-e1627.