Post-Concussion Autonomic Dysfunction: Symptoms, Causes & What Helps

If you are dealing with dizziness, fatigue, a racing heart, exercise intolerance, headaches, or feeling significantly worse when you stand up or exert yourself after a concussion, your symptoms may be related in part to changes in your autonomic nervous system.

This is sometimes called post-concussion autonomic dysfunction or dysautonomia after concussion.

The autonomic nervous system plays an important role in regulating heart rate, blood pressure, blood flow, breathing, body temperature, digestion, and your body's response to physical and mental stress. After a concussion, some people experience changes in autonomic regulation that can contribute to exercise intolerance, dizziness, fatigue, and other persistent symptoms.

But autonomic dysfunction is only one piece of concussion recovery.

Persistent concussion symptoms can involve several interconnected systems, including the autonomic, vestibular, visual, cervical, cardiovascular, and cognitive systems. Identifying which factors are contributing to your symptoms is an important part of determining the right rehabilitation approach.

Most importantly, persistent concussion symptoms are not a reason to simply wait longer and hope they disappear. Concussion recovery is an active process, and appropriately prescribed rehabilitation can address the impairments that are keeping you from returning to normal activity.

What Is Autonomic Dysfunction After a Concussion?

Your autonomic nervous system (ANS) controls many of the functions your body performs automatically, without you having to consciously think about them.

It helps regulate:

• Heart rate

• Blood pressure

• Blood flow

• Breathing

• Body temperature

• Sweating

• Digestion

• Energy regulation

• Your physiological response to physical and emotional stress

The autonomic nervous system is constantly making adjustments as the demands on your body change.

For example, when you stand up, your cardiovascular system has to rapidly adjust to keep enough blood flowing to your brain. When you exercise, your heart rate, blood pressure, breathing, blood flow, and energy demands all change.

After a concussion, some people experience altered autonomic responses. Research has identified changes in cardiovascular autonomic function following concussion, and these changes may contribute to exercise intolerance and other symptoms in some individuals.

This does not mean that everyone with persistent concussion symptoms has autonomic dysfunction.

Dizziness, fatigue, headaches, brain fog, nausea, and exercise intolerance can have multiple causes. A person may have vestibular dysfunction, cervical dysfunction, visual dysfunction, migraine-related symptoms, sleep disruption, autonomic dysfunction, or several of these occurring at the same time.

That is why concussion rehabilitation should look at the whole picture rather than treating one system in isolation.

What Are the Symptoms of Autonomic Dysfunction After a Concussion?

Autonomic dysfunction can look different from one person to another.

Some people notice symptoms primarily when they stand up. Others notice them during exercise, after physical exertion, or after prolonged periods of mental activity.

Possible symptoms include:

• Dizziness or lightheadedness when standing

• A rapid increase in heart rate with relatively little activity

• Feeling unusually fatigued

• Exercise intolerance

• Feeling significantly worse after exercise

• Headaches after physical exertion

• Brain fog or difficulty concentrating

• Feeling shaky or weak

• Difficulty tolerating prolonged standing

• Increased sensitivity to heat

• Feeling unwell in hot environments

• Nausea

• Shortness of breath or unusual difficulty tolerating exertion

• A feeling that your body is not responding normally to physical activity

One pattern that can be particularly informative is when symptoms are relatively manageable while sitting or lying down but become much more noticeable when you:

• Stand

• Walk

• Exercise

• Spend a long time upright

• Work physically

• Concentrate for extended periods

• Enter a hot environment

That pattern does not automatically diagnose autonomic dysfunction, but it can be an important clue that your cardiovascular and autonomic responses should be evaluated.

Why Does My Heart Rate Increase So Much After a Concussion?

One common complaint after concussion is noticing that your heart rate rises much more quickly than it used to.

You may notice this when:

• Standing up

• Walking up stairs

• Walking at a normal pace

• Exercising

• Doing household activities

• Returning to a workout you previously tolerated easily

Changes in autonomic regulation may contribute to an exaggerated heart-rate response to standing or exercise in some people after concussion.

However, a rapid heart rate is not automatically caused by autonomic dysfunction. Dehydration, deconditioning, medications, cardiovascular conditions, anxiety, illness, and other factors can produce similar symptoms.

If you are experiencing significant or persistent changes in heart rate, especially if they are accompanied by fainting, chest pain, shortness of breath, or other concerning symptoms, you should be medically evaluated rather than assuming the symptoms are simply part of your concussion.

Why Do I Feel Dizzy When I Stand Up After a Concussion?

Dizziness when standing can occur when the cardiovascular and autonomic systems do not adequately adjust to the change in position.

When you stand, gravity causes blood to shift toward the lower part of your body. Your cardiovascular system normally responds by adjusting blood vessel tone and heart rate to maintain adequate blood flow to the brain.

If that response is not working efficiently, you may experience:

• Lightheadedness

• Dizziness

• Weakness

• Fatigue

• A racing heart

• Feeling faint

• Brain fog

• Feeling better again after sitting or lying down

This is sometimes referred to as orthostatic intolerance.

But dizziness after concussion is not necessarily autonomic.

Vestibular dysfunction, visual problems, neck dysfunction, migraine, blood-pressure changes, dehydration, and other factors can produce similar symptoms.

This is why identifying the source or combination of sources contributing to your symptoms matters.

What Is the Connection Between Autonomic Dysfunction and Exercise Intolerance?

Exercise intolerance is one of the most frustrating symptoms for people recovering from concussion.

You may have been physically active before your injury and suddenly find that even a relatively easy workout causes:

• Headache

• Dizziness

• Nausea

• Brain fog

• Fatigue

• Increased heart rate

• Feeling shaky or weak

• A significant increase in symptoms afterward

It can be confusing because you may have heard that exercise is beneficial for concussion recovery.

Both things can be true.

Exercise can be an important part of concussion rehabilitation, while the wrong amount or intensity of exercise can temporarily worsen symptoms.

The goal is not to push through severe symptoms.

But the goal is also not to avoid exercise indefinitely.

Current concussion consensus supports early, appropriately prescribed physical activity and aerobic exercise rather than strict rest until all symptoms disappear. Exercise intensity can be progressed systematically according to the individual's response.

The key is determining the right starting point and the right progression for your current level of tolerance.

Why Does Exercise Make My Concussion Symptoms Worse?

If exercise consistently makes you feel worse, it does not necessarily mean that exercise is harmful for you.

The problem may be:

• The intensity is too high

• The duration is too long

• You are progressing too quickly

• You are exercising in an upright position that you don't currently tolerate well

• You are exercising too frequently

• Your cardiovascular system is not yet tolerating the demand

• Another concussion-related impairment is contributing to your symptoms

For some people, walking or recumbent cycling may be a better starting point than running, high-intensity intervals, or demanding upright exercise.

A rehabilitation program can help determine your current exercise threshold and progressively increase the workload rather than requiring you to guess how much exercise is appropriate each day.

Related Article: Why Does Exercise Make

The "Boom and Bust" Cycle After Concussion

A common pattern with persistent concussion symptoms looks like this:

Feel a little better → do too much → feel terrible → stop everything → recover somewhat → try again → repeat.

This is sometimes called a boom-and-bust cycle.

You may have a good day and assume you are finally recovered. You return to your previous workout, work a full day, catch up on everything you have been avoiding, or try to exercise at your old intensity.

Then your symptoms flare.

You may respond by completely stopping activity for several days.

The problem is that neither extreme necessarily helps you rebuild your tolerance.

A more effective approach is often consistent, appropriately dosed activity with gradual progression.

The goal is to gradually increase your ability to tolerate the physical and cognitive demands of normal life.

Autonomic Dysfunction Is Only One Piece of Concussion Recovery

This is an important distinction.

It is tempting to hear about autonomic dysfunction and conclude:

"That's why I am still having symptoms."

But concussion recovery is more complicated than that.

The systems involved in concussion recovery are interconnected.

For example, someone experiencing dizziness may have contributions from:

• The vestibular system

• Vision and eye movements

• The cervical spine

• Autonomic regulation

• Exercise intolerance

• Migraine

• Sleep disruption

• Balance and sensory integration

Someone with headaches may have contributions from the neck, vestibular system, visual system, migraine mechanisms, autonomic regulation, sleep, or several of these simultaneously.

Someone who becomes dizzy during exercise may have both exercise intolerance and vestibular dysfunction.

This is why I don't approach concussion recovery as a collection of isolated symptoms.

The goal is to understand how the different systems are interacting and address the impairments that are actually limiting recovery.

For more information about why concussion symptoms can persist, read:

[Why Do I Still Have Concussion Symptoms Months Later?]

How Is Post-Concussion Autonomic Dysfunction Treated?

Treatment depends on what is actually contributing to your symptoms.

There is not one exercise or one treatment that is appropriate for everyone with post-concussion autonomic symptoms.

A rehabilitation program may include:

Cardiovascular Exercise

A structured aerobic exercise program can help gradually rebuild exercise tolerance.

The starting intensity and duration should be individualized rather than based on what you were able to do before your concussion.

Gradual Exercise Progression

Exercise can be progressed by changing:

• Duration

• Intensity

• Frequency

• Position

• Type of activity

The objective is to provide an appropriate level of challenge without repeatedly overwhelming your current tolerance.

Vestibular Rehabilitation

If dizziness, balance problems, motion sensitivity, or visual-vestibular symptoms are contributing to your limitations, vestibular rehabilitation may be appropriate.

Cervical Rehabilitation

Neck dysfunction can contribute to headaches, dizziness, and other symptoms after concussion.

Cervicovestibular rehabilitation is recommended when appropriate for people with persistent neck pain, headaches, dizziness, or balance problems.

Visual and Cognitive Rehabilitation

Problems with eye movements, visual motion, reading, screen use, concentration, or cognitive endurance can also contribute to persistent symptoms.

Autonomic Retraining

When autonomic dysfunction or exercise intolerance is part of the clinical picture, rehabilitation can include appropriately prescribed cardiovascular and autonomic training.

Sleep and Recovery Strategies

Sleep disruption can significantly affect your ability to tolerate physical and cognitive activity and should be considered as part of the overall recovery process.

What Can You Do at Home to Support Recovery?

There are several things you can do at home to support concussion recovery.

These strategies do not replace an individualized evaluation, but they can provide a better foundation for rehabilitation.

1. Don't Completely Stop Moving

Strict rest until you are symptom-free is not recommended.

Current concussion guidelines support relative rest for the first 24–48 hours followed by a gradual return to physical activity as tolerated.

That does not mean you should push through significant symptoms.

It means that complete inactivity is generally not the goal.

If exercise is currently difficult, start with an amount and type of movement that you can tolerate and gradually build from there.

2. Eat Regular, Nutrient-Dense Meals

Your body and brain require energy and nutrients during recovery.

Focus on:

• Regular meals

• Whole foods

• Adequate protein

• Fruits and vegetables

• Healthy fats

• Adequate overall calorie intake

Avoid routinely skipping meals, particularly if you are already struggling with fatigue, dizziness, or exercise intolerance.

Nutrition is supportive of recovery; it is not a stand-alone treatment for concussion.

3. Stay Hydrated

Adequate hydration is particularly important if you are experiencing dizziness, fatigue, exercise intolerance, or symptoms that are worse when standing.

If you have been given specific fluid or sodium recommendations by your physician, follow those recommendations.

4. Prioritize Sleep

Sleep is an important component of concussion recovery.

If you are having difficulty falling asleep, staying asleep, waking frequently, or feeling unrefreshed despite getting enough hours in bed, sleep should be addressed rather than simply accepted as another concussion symptom.

[Why Can't I Sleep After a Concussion?]

5. Gradually Return to Normal Activity

It can be tempting to eliminate anything that causes symptoms.

But avoiding every activity that produces even a small symptom response can make it difficult to rebuild tolerance to normal life.

The goal is not to live in a completely symptom-free bubble.

The goal is to gradually return to the physical, cognitive, and social activities that matter to you.

What About POTS After a Concussion?

You may have heard of POTS, or postural orthostatic tachycardia syndrome, particularly if you experience a significant increase in heart rate when standing.

POTS is a specific medical condition involving an abnormal heart-rate response to standing.

It is not synonymous with concussion-related autonomic dysfunction.

Some people may develop orthostatic intolerance or POTS following a concussion or other illness, but the diagnosis requires appropriate medical evaluation.

If you experience significant dizziness when standing, fainting, unusual heart-rate changes, or other concerning cardiovascular symptoms, talk with an appropriate healthcare professional.

For more information, see:

POTS and Concussion: How Blood Pressure and Heart Rate Changes Can Affect Recovery

When Should You Get Evaluated for Post-Concussion Autonomic Dysfunction?

You don't need to wait months before addressing problems with exercise tolerance, dizziness, or other concussion symptoms.

If you are having difficulty returning to normal physical activity, work, school, exercise, or sport, an evaluation can help determine what is actually contributing to the problem.

This is particularly important if you notice:

• Dizziness when standing

• A significant increase in heart rate with activity

• Exercise intolerance

• Symptoms that consistently worsen with exertion

• Difficulty tolerating normal daily activities

• Persistent fatigue

• Headaches after physical activity

• Difficulty progressing back to exercise or sport

The Amsterdam International Consensus Statement recommends active rehabilitation and a multimodal clinical assessment when concussion symptoms persist, rather than simply continuing to wait for symptoms to resolve.

At the same time, certain symptoms require medical evaluation rather than being assumed to be concussion-related, including fainting, chest pain, severe or worsening headache, new neurological symptoms, or significant heart-rate abnormalities.

Can Physical Therapy Help With Post-Concussion Autonomic Dysfunction?

Yes.

A concussion-focused physical therapist can evaluate how different systems are contributing to your symptoms and determine what should be addressed first.

Depending on your presentation, treatment may include:

• Cardiovascular exercise progression

• Autonomic retraining

• Vestibular rehabilitation

• Balance training

• Visual and oculomotor exercises

• Cervical mobility and strengthening

• Headache treatment

• Exercise tolerance training

• Gradual return to physical activity

• Strategies for managing cognitive and physical load

The important part is that these aren't necessarily separate problems.

Your neck, vestibular system, vision, cardiovascular system, autonomic nervous system, and brain all have to work together during normal movement and activity.

That is why an effective concussion rehabilitation program should consider how these systems interact rather than treating each symptom independently.

You Don't Have to Figure Out Concussion Recovery on Your Own

If you've been dealing with symptoms for weeks or months, you may have already tried:

• Resting

• Avoiding exercise

• Limiting screens

• Returning to your normal workouts

• Trying random concussion exercises

• Changing your diet

• Waiting for symptoms to disappear

And you may still be wondering:

What am I actually supposed to do?

That is exactly why I created The Concussion Solution.

It’s a structured online program that walks you through progressive exercises and strategies addressing the systems commonly involved in concussion recovery, including exercise tolerance, autonomic regulation, vestibular function, vision, the neck, headaches, sleep, and pacing.

Frequently Asked Questions About Post-Concussion Autonomic Dysfunction

Can a concussion cause autonomic dysfunction?

Yes. Research has identified altered autonomic responses in some people following concussion, and these changes may contribute to exercise intolerance and other symptoms. However, not everyone with persistent concussion symptoms has autonomic dysfunction.

What are the symptoms of dysautonomia after concussion?

Symptoms may include dizziness when standing, exercise intolerance, fatigue, rapid heart rate with activity, headaches after exertion, difficulty tolerating heat, brain fog, and difficulty with prolonged standing. These symptoms can also have other causes.

Why does my heart rate increase after a concussion?

Changes in autonomic regulation may contribute to an exaggerated heart-rate response to standing or exercise in some people after concussion. Other factors can produce similar symptoms, so significant or persistent heart-rate changes should be evaluated.

Why do I feel dizzy when I stand up after a concussion?

Dizziness when standing may be related to orthostatic intolerance or autonomic dysfunction. However, dehydration, blood-pressure changes, vestibular dysfunction, and other factors can also contribute.

Why does exercise make my concussion symptoms worse?

Exercise can temporarily increase symptoms when the demands of the activity exceed your current exercise tolerance. Autonomic dysfunction may contribute to exercise intolerance in some people, but it is not the only possible explanation.

Should I stop exercising if I have post-concussion autonomic dysfunction?

Not necessarily. Current evidence supports appropriately prescribed physical activity and aerobic exercise rather than prolonged strict rest. The appropriate intensity and progression depend on the individual.

Can you treat autonomic dysfunction after concussion with physical therapy?

Physical therapy can address exercise intolerance and other impairments that may be contributing to symptoms after concussion. Depending on the individual's presentation, rehabilitation may include cardiovascular exercise progression, autonomic retraining, vestibular rehabilitation, cervical treatment, visual exercises, balance training, and gradual return to activity.

Is POTS the same thing as autonomic dysfunction after concussion?

No. POTS is a specific medical diagnosis. Concussion-related autonomic dysfunction is a broader term describing changes in autonomic regulation that may occur after concussion. Someone with concussion symptoms should not assume they have POTS based on symptoms alone.

What Should You Do If You Think You Have Post-Concussion Autonomic Dysfunction?

If you are experiencing dizziness when standing, unusual heart-rate changes, exercise intolerance, fatigue, or symptoms that consistently worsen with physical activity, you don't need to simply wait and hope they resolve.

These symptoms can have multiple causes, and autonomic dysfunction may be only one part of the picture. Understanding which systems are contributing to your symptoms is an important part of effective concussion rehabilitation.

The goal isn't simply to manage symptoms. It's to identify what is contributing to them and progressively rebuild your ability to tolerate the physical and cognitive demands of everyday life.

Want a Structured Plan for Concussion Recovery?

If you're struggling to figure out what exercises to do, how much activity is appropriate, or how to progress without repeatedly triggering your symptoms, The Concussion Solution was created to give you that structure.

It's a step-by-step online concussion recovery program that addresses the interconnected systems involved in recovery, including exercise tolerance, autonomic regulation, vestibular function, vision, the neck, headaches, sleep, and pacing.

Learn More About The Concussion Solution

Related Articles

What is a Concussion? Understanding What Happens to Your Brain

Why Do I Still Have Concussion Symptoms Months Later?

POTS After Concussion: Blood Pressure and Heart Rate Dysfunction

Natural Remedies for Persistent Post-Concussion Symptoms