Dysautonomia and POTS in Phoenix, Arizona

How the Autonomic Nervous System Can Affect Heart Rate, Blood Pressure, Dizziness, Brain Fog, Digestion, Sweating, and Fatigue.

When patients hear the word neurology, they often think about headaches, seizures, memory loss, multiple sclerosis, Parkinson’s disease, or nerve pain. But the nervous system also controls many automatic functions that most people never think about until something goes wrong.

Your heart rate, blood pressure, sweating, temperature control, digestion, circulation, bladder function, and response to standing are all influenced by the autonomic nervous system. When this system does not regulate the body correctly, patients may experience a wide range of symptoms that can be confusing, frustrating, and difficult to diagnose.

This is called dysautonomia.

One of the most recognized forms of dysautonomia is Postural Orthostatic Tachycardia Syndrome, also known as POTS. POTS can cause dizziness, rapid heartbeat, palpitations, fainting, fatigue, brain fog, weakness, exercise intolerance, and symptoms that worsen when standing.

At Center for Neurology and Spine in Phoenix, Arizona, we offer POTS testing and autonomic evaluation for patients with symptoms of dysautonomia, orthostatic intolerance, dizziness, fainting, tachycardia, fatigue, and brain fog. Our neurology team evaluates complex symptoms to help patients understand whether the autonomic nervous system may be contributing to their condition.

CNS serves patients throughout Phoenix, North Phoenix, Biltmore, Arcadia, Scottsdale, Tempe, Mesa, Chandler, Gilbert, Glendale, Peoria, Paradise Valley, Ahwatukee, and surrounding Arizona communities.

If you are searching for POTS testing Phoenix, dysautonomia testing Arizona, autonomic testing Phoenix, tilt table testing Phoenix, neurologist for POTS Phoenix, dizziness specialist Phoenix, or orthostatic intolerance evaluation Arizona, this guide explains what dysautonomia is, how POTS fits into it, and why testing can help.

What Is Dysautonomia?

Dysautonomia is a broad term used when the autonomic nervous system is not working properly. The autonomic nervous system is the part of the nervous system that controls automatic body functions.

These functions include:

Heart rate

Blood pressure

Blood vessel tone

Sweating

Body temperature regulation

Digestion

Bladder function

Pupil response

Circulation when standing

Response to heat

Response to meals

Response to stress

Response to exercise

Because the autonomic nervous system affects so many parts of the body, dysautonomia can cause symptoms that seem unrelated. One patient may have dizziness and fainting. Another may have rapid heartbeat and brain fog. Another may have heat intolerance, nausea, fatigue, abnormal sweating, and weakness.

This is one reason dysautonomia is often missed. Patients may see multiple specialists before anyone connects the symptoms to autonomic nervous system dysfunction.

What Is POTS?

POTS stands for Postural Orthostatic Tachycardia Syndrome.

Postural means related to body position.

Orthostatic means related to standing upright.

Tachycardia means fast heart rate.

Syndrome means a group of symptoms that occur together.

In POTS, the body has difficulty adjusting when a person moves from lying down to standing. The heart rate rises more than expected, often causing symptoms such as dizziness, lightheadedness, palpitations, shakiness, fatigue, brain fog, and weakness.

Many patients with POTS feel better when lying down and worse when standing, walking, showering, waiting in line, exercising, or being in the heat.

POTS is not simply anxiety. It is not simply being out of shape. It is not just dehydration, although dehydration can make symptoms worse. POTS is a disorder involving autonomic regulation and circulation.

Why the Autonomic Nervous System Matters

The autonomic nervous system acts like the body’s internal autopilot. It constantly adjusts the body without you having to think about it.

When you stand up, gravity pulls blood toward your legs and lower body. A healthy autonomic nervous system responds quickly by tightening blood vessels and adjusting heart rate so enough blood returns to the heart and brain.

When this system does not respond properly, blood may pool in the lower body. The heart may beat faster to compensate. Blood pressure may fluctuate. The brain may not receive steady circulation during upright posture. The result can be dizziness, fainting, weakness, fatigue, and brain fog.

This is why POTS and dysautonomia can affect daily life so dramatically. The problem may not show up when a patient is lying down or sitting still in an exam room. Symptoms often appear when the body is challenged by standing, heat, meals, exercise, illness, or dehydration.

Symptoms of POTS and Dysautonomia

POTS and dysautonomia can affect multiple body systems. Symptoms vary from person to person.

Common symptoms include:

Dizziness when standing

Lightheadedness

Rapid heartbeat

Palpitations

Near fainting

Fainting

Brain fog

Fatigue

Weakness

Shakiness

Exercise intolerance

Shortness of breath when upright

Heat intolerance

Nausea

Abdominal discomfort

Bloating

Headaches or migraine

Poor concentration

Sleep disruption

Abnormal sweating

Cold hands or feet

Color changes in the hands or feet

Symptoms that worsen after showers

Symptoms that worsen after large meals

Symptoms that improve when lying down

Patients often say their symptoms are unpredictable. They may feel better one day and worse the next. They may tolerate one activity but crash after another. They may look healthy while sitting but struggle to function upright.

Why Dysautonomia Can Be So Difficult to Diagnose

Dysautonomia can be difficult to diagnose because many routine tests can be normal.

A patient may have a normal EKG, normal basic blood work, normal imaging, or normal vital signs while sitting. But when heart rate and blood pressure are measured during standing or tilt testing, the abnormal pattern may become more obvious.

Dysautonomia may be missed when:

Heart rate is checked only while sitting

Blood pressure is not measured during position changes

Symptoms are blamed on anxiety without autonomic testing

The patient looks well during the office visit

Symptoms come and go

The patient is young or otherwise healthy

Routine cardiac testing is normal

Symptoms involve multiple body systems

Testing does not reproduce symptoms on that particular day

This does not mean the symptoms are not real. It means the right type of testing may be needed.

POTS, Dysautonomia, and Brain Fog

Brain fog is one of the most common and frustrating symptoms patients describe. It may feel like difficulty concentrating, trouble finding words, poor memory, slow thinking, mental fatigue, or feeling disconnected.

Brain fog in POTS and dysautonomia may worsen when upright because the body is struggling to regulate circulation and autonomic function. It may also be affected by poor sleep, migraine, dehydration, medication side effects, pain, fatigue, and post-viral symptoms.

Patients may say:

I think more clearly when I lie down.

I cannot concentrate after standing for too long.

My brain fog gets worse in the heat.

I feel mentally drained after simple errands.

I look normal, but I cannot function like I used to.

At CNS, brain fog is evaluated in context. The goal is to determine whether symptoms may be related to POTS, dysautonomia, migraine, sleep issues, medication effects, cognitive disorders, seizures, or another neurological condition.

POTS, Dysautonomia, and Migraine

Migraine and dysautonomia can overlap. Many patients with POTS also report headaches, light sensitivity, nausea, dizziness, neck discomfort, and brain fog.

Migraine is a neurological disorder, not just a headache. It can involve the autonomic nervous system, sensory sensitivity, blood vessel signaling, nausea pathways, and environmental triggers.

For some patients, migraine and POTS make each other worse. Dehydration, poor sleep, heat, skipped meals, stress, and hormonal changes may trigger both migraine and autonomic symptoms.

Patients with migraine and POTS may experience:

Headache with dizziness

Nausea

Light sensitivity

Sound sensitivity

Brain fog

Neck pain

Fatigue

Worsening symptoms during heat

Difficulty exercising

At CNS, patients can be evaluated for both migraine and autonomic symptoms, allowing for a more complete treatment plan.

POTS, Dysautonomia, and Neuropathy

Some patients with dysautonomia also experience nerve-related symptoms such as numbness, tingling, burning pain, abnormal sweating, or color changes in the hands and feet.

These symptoms may suggest involvement of peripheral nerves or small nerve fibers. A neurologic evaluation can help determine whether neuropathy testing, EMG testing, nerve conduction studies, or additional evaluation may be appropriate.

Symptoms that may suggest nerve involvement include:

Burning pain in the feet

Tingling in the hands or feet

Numbness

Electric shock sensations

Reduced sweating

Excessive sweating

Color changes in the feet

Sensitivity to touch

Balance problems

Weakness

Not every patient with POTS has neuropathy, but when nerve symptoms are present, they should be evaluated.

POTS, Dysautonomia, and Long COVID

Some patients develop dysautonomia symptoms after a viral illness, including COVID. These patients may notice that they were functioning normally before illness, but afterward they developed dizziness, rapid heartbeat, fatigue, brain fog, exercise intolerance, and symptoms that worsen when standing.

This pattern is sometimes described as post-viral dysautonomia.

Post-viral symptoms may include:

Rapid heartbeat after standing

Dizziness

Fatigue

Brain fog

Exercise intolerance

Weakness

Shortness of breath with activity

Worsening symptoms after exertion

Symptoms that improve lying down

Testing can help determine whether POTS or another form of orthostatic intolerance may be contributing to the patient’s symptoms.

Why Arizona Heat Can Make Dysautonomia Worse

Phoenix heat can make dysautonomia and POTS symptoms worse. Heat causes blood vessels to widen and increases sweating. This can worsen blood pooling, dehydration, dizziness, fatigue, and rapid heartbeat.

Patients in Arizona may notice symptoms worsen during:

Summer heat

Hot showers

Outdoor events

Walking through parking lots

Standing in lines

Exercising in warm weather

Getting into a hot car

Dehydration from dry air

Monsoon humidity changes

Travel days

A treatment plan for dysautonomia in Phoenix should account for real life in the desert climate.

Arizona-specific strategies may include:

Planning errands early in the morning

Avoiding outdoor activity during peak heat

Using cooling towels or portable fans

Hydrating before leaving home if medically appropriate

Sitting when waiting in lines

Using shaded parking when possible

Avoiding hot showers after activity

Exercising indoors or in water

Discussing compression garments with your clinician

Talking with your clinician before increasing salt intake

These strategies do not replace medical care, but they may help reduce daily symptom flares.

What Is POTS Testing?

POTS testing evaluates how the body responds to standing or upright positioning. The purpose is to measure heart rate, blood pressure, symptoms, and autonomic responses during position change.

Testing may include:

Orthostatic vital signs

Tilt table testing

Heart rate monitoring

Blood pressure monitoring

Autonomic reflex evaluation

Symptom tracking during testing

Medication and trigger review

Neurological examination

POTS testing can help determine whether symptoms match a measurable autonomic pattern. It can also help distinguish POTS from other causes of dizziness, fainting, palpitations, and fatigue.

What Is Tilt Table Testing?

Tilt table testing is commonly used to evaluate POTS, fainting, and orthostatic intolerance.

During a tilt table test, the patient lies on a special table while heart rate and blood pressure are monitored. The patient is secured safely, and the table is tilted upright to simulate standing. The care team watches how heart rate, blood pressure, and symptoms change.

Tilt table testing can help evaluate:

POTS

Vasovagal syncope

Orthostatic hypotension

Orthostatic intolerance

Unexplained fainting

Unexplained dizziness

Heart rate response to standing

Blood pressure response to standing

For many patients, tilt table testing provides objective evidence of what they experience in daily life.

What Else Can Look Like POTS?

Many conditions can mimic or overlap with POTS and dysautonomia. This is why accurate evaluation matters.

Possible mimics or related conditions include:

Anxiety or panic symptoms

Dehydration

Anemia

Thyroid disease

Medication side effects

Vasovagal syncope

Orthostatic hypotension

Cardiac rhythm disorders

Vestibular disorders

Migraine

Long COVID

Chronic fatigue syndrome

Small fiber neuropathy

Ehlers-Danlos syndrome

Autoimmune disease

Sleep disorders

A neurologic evaluation can help determine whether symptoms are caused by POTS, another form of dysautonomia, or a different condition.

How Treatment Is Personalized

Treatment for POTS and dysautonomia depends on the patient’s specific symptoms, test results, blood pressure pattern, heart rate response, medical history, medications, and daily triggers.

Treatment may include:

Education about dysautonomia

Fluid optimization when appropriate

Salt guidance when medically appropriate

Compression garments

Heat avoidance

Slow position changes

Smaller meals

Sleep improvement

Gradual exercise conditioning

Migraine treatment if needed

Medication review

Medications for heart rate or blood pressure support in selected patients

Treatment of overlapping neuropathy symptoms if present

Follow-up monitoring

The goal is not just to reduce heart rate. The goal is to improve function, reduce flares, prevent fainting, support daily activity, and help patients understand their condition.

What to Track Before Your Appointment

Patients can help the evaluation by tracking symptoms before their visit.

Helpful details include:

Heart rate lying down

Heart rate standing

Blood pressure lying down and standing if available

Time of day symptoms are worst

Symptoms after showers

Symptoms after meals

Heat exposure

Fluid intake

Exercise tolerance

Fainting or near-fainting episodes

Migraine or headache patterns

Sleep quality

Medication and supplement list

Recent illness or COVID history

Prior cardiology testing

Prior emergency room visits

Bring any previous test results, including EKGs, heart monitor reports, blood work, imaging, or prior tilt table testing.

When to Seek Urgent Care

Some symptoms should not wait for a routine appointment.

Seek urgent medical care for:

New or severe chest pain

Sudden weakness on one side

Facial drooping

Trouble speaking

Sudden severe headache

New seizure

Fainting with injury

Severe shortness of breath

Sudden vision loss

Persistent confusion

Rapidly worsening neurological symptoms

POTS and dysautonomia can cause significant symptoms, but emergency warning signs should always be taken seriously.

Why Choose Center for Neurology and Spine for Dysautonomia and POTS Testing?

Center for Neurology and Spine offers neurologist-led evaluation for POTS and dysautonomia in Phoenix, Arizona.

Patients choose CNS because we offer:

POTS testing in Phoenix

Autonomic testing in Arizona

Tilt table testing

Evaluation for dizziness and fainting

Evaluation for rapid heartbeat when standing

Evaluation for brain fog and fatigue

Care for migraine and headache overlap

Care for neuropathy symptoms

Neurologic interpretation of complex symptoms

Personalized treatment planning

CNS provides care for patients across Phoenix, North Phoenix, Biltmore, Arcadia, Scottsdale, Tempe, Mesa, Chandler, Gilbert, Glendale, Peoria, Paradise Valley, Ahwatukee, and nearby Arizona communities.

Frequently Asked Questions

What is dysautonomia?

Dysautonomia is a term used when the autonomic nervous system does not regulate automatic body functions properly. It can affect heart rate, blood pressure, sweating, digestion, temperature control, and circulation.

Is POTS a type of dysautonomia?

Yes. POTS is one type of dysautonomia. It involves symptoms that worsen when standing, along with an abnormal heart rate response to upright posture.

What are common symptoms of POTS?

Common symptoms include dizziness, rapid heartbeat, palpitations, lightheadedness, fainting, fatigue, brain fog, weakness, shakiness, exercise intolerance, nausea, and heat intolerance.

Can POTS cause brain fog?

Yes. Many patients with POTS report brain fog, poor concentration, slowed thinking, and mental fatigue, especially when upright.

Can dysautonomia affect digestion?

Yes. Because the autonomic nervous system helps regulate digestion, some patients with dysautonomia report nausea, bloating, constipation, diarrhea, or abdominal discomfort.

Can anxiety mimic POTS?

Yes. Anxiety can cause rapid heartbeat and shakiness, but POTS symptoms are often posture-related and can be measured with heart rate and blood pressure testing during standing or tilt.

Does Arizona heat make POTS worse?

Yes. Heat can worsen blood pooling, dehydration, sweating, dizziness, fatigue, and rapid heartbeat in patients with POTS or dysautonomia.

What is tilt table testing?

Tilt table testing monitors heart rate and blood pressure while the body is moved from lying down to upright positioning. It is commonly used to evaluate POTS, fainting, and orthostatic intolerance.

Does CNS offer POTS testing in Phoenix?

Yes. Center for Neurology and Spine offers POTS testing and autonomic evaluation in Phoenix, Arizona.

Schedule POTS and Dysautonomia Testing in Phoenix

If you are living with dizziness, rapid heartbeat, fainting, brain fog, fatigue, heat intolerance, weakness, palpitations, exercise intolerance, or symptoms that worsen when standing, Center for Neurology and Spine can help.

CNS offers POTS testing and dysautonomia evaluation in Phoenix for patients across the Valley.

Visit cnsofaz.com or centerforneurologyandspine.com to request an appointment and take the next step toward understanding your symptoms.

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