Why POTS Is Often Missed: A Phoenix Neurology Guide to Dizziness, Rapid Heartbeat, Fainting, and Aut

If you have been living with dizziness, rapid heartbeat, lightheadedness, fainting, palpitations, fatigue, brain fog, or exercise intolerance, you may have been told your symptoms are due to anxiety, dehydration, stress, or “just being out of shape.”

For many patients, that explanation does not feel complete. The symptoms are real, often disabling, and may point to a problem with the autonomic nervous system called Postural Orthostatic Tachycardia Syndrome, or POTS.

At Center for Neurology & Spine in Phoenix, Arizona, we now offer POTS testing and autonomic evaluation for patients who need answers. POTS can be difficult to recognize because symptoms often overlap with other conditions, including anxiety disorders, cardiac rhythm issues, thyroid disease, dehydration, chronic fatigue, long COVID, migraine, Ehlers-Danlos syndrome, and vasovagal syncope. That is why accurate testing matters.

Patients at CNS are evaluated by Mayo-trained neurologists Dr. Leslie Zuniga and Dr. Rebecca Jones, who provide specialized neurologic care for complex symptoms involving dizziness, tachycardia, fainting, and autonomic dysfunction. If you are searching for POTS testing near me, POTS diagnosis Phoenix, autonomic testing Arizona, tilt table testing Phoenix, or a neurologist for POTS, this guide explains what to know before your evaluation.

What Makes POTS Different From Ordinary Dizziness

Dizziness can happen for many reasons. Some people feel dizzy from dehydration, inner ear problems, medication side effects, anemia, blood pressure changes, or panic attacks. POTS is different because the symptoms are strongly related to posture.

In POTS, the body has difficulty adjusting when a person moves from lying down to standing. Instead of smoothly regulating blood flow, heart rate, and blood pressure, the autonomic nervous system overreacts. The heart rate rises too much, and the patient may feel lightheaded, shaky, weak, nauseated, short of breath, or mentally foggy.

According to the National Institute of Neurological Disorders and Stroke, the classic symptom of POTS is a fast heartbeat, often increasing by more than 30 beats per minute or exceeding 120 beats per minute within 10 minutes of standing; in adolescents, the threshold is typically 40 beats per minute. Johns Hopkins similarly describes POTS as involving symptoms with upright posture plus a heart rate increase of at least 30 beats per minute in adults or 40 beats per minute in adolescents during the first 10 minutes of standing or tilt table testing.

That measurable physiologic change is one reason POTS testing is so important. It can help separate true autonomic dysfunction from vague or nonspecific dizziness.

Common Symptoms That May Suggest POTS

POTS can affect more than heart rate. Because the autonomic nervous system helps regulate circulation, digestion, sweating, temperature control, and alertness, symptoms can involve many parts of the body.

Common POTS symptoms include:

Dizziness when standing
Rapid heartbeat
Palpitations
Lightheadedness
Near fainting or fainting
Fatigue
Brain fog
Weakness
Exercise intolerance
Shortness of breath with standing
Headaches or migraine flares
Nausea or abdominal discomfort
Shakiness
Heat intolerance
Poor concentration
Symptoms that improve when lying down

Cleveland Clinic describes POTS as a condition that causes symptoms when transitioning from lying down to standing, including fast heart rate, dizziness, and fatigue. This posture-related pattern is one of the most important clues.

Why POTS Is Frequently Misdiagnosed

POTS is often missed because patients may look healthy during a routine office visit. Blood pressure may be normal when sitting. Standard blood work may be unrevealing. A resting EKG may be normal. Many patients are young or middle-aged and may be told their symptoms are stress-related.

Common reasons POTS is overlooked include:

Symptoms come and go
Routine testing may be normal
Symptoms overlap with anxiety and panic
Heart rate changes may not be checked while standing
Patients may have multiple symptoms across different body systems
Many clinicians do not routinely evaluate autonomic dysfunction

A patient may see urgent care, primary care, cardiology, ENT, gastroenterology, and psychiatry before anyone performs orthostatic vitals or autonomic testing. That delay can be frustrating and emotionally exhausting.

At CNS, the goal is to look at the full neurologic and autonomic picture instead of treating symptoms in isolation.

POTS Is Not “Just Anxiety”

Many patients with POTS are told they have anxiety because symptoms can feel similar: racing heart, shortness of breath, trembling, chest discomfort, and lightheadedness. Anxiety can certainly coexist with POTS, especially when symptoms are unpredictable. But POTS itself is a physiologic disorder of autonomic regulation.

A key distinction is timing. POTS symptoms are usually triggered or worsened by standing, heat, dehydration, exertion, or prolonged upright activity. Panic attacks can occur without positional triggers. Objective testing helps clarify whether the heart rate response is abnormal during posture change.

This distinction matters because treatment is different. A patient with POTS may need hydration strategies, salt guidance when appropriate, compression garments, graded exercise therapy, medication adjustments, and autonomic follow-up. Labeling the condition as anxiety alone may delay effective care.

What Happens During POTS Testing at CNS

POTS testing is designed to measure how your body responds to positional change and physiologic stress. The purpose is not only to see whether your heart rate rises, but also to understand how your blood pressure, autonomic reflexes, and symptoms behave together.

A CNS autonomic evaluation may include:

Detailed neurologic history
Orthostatic vital signs
Tilt table testing
Heart rate and blood pressure monitoring
Autonomic reflex assessment
Review of medications and triggers
Evaluation for overlapping neurologic conditions

Tilt Table Testing

Tilt table testing is one of the most useful tools for evaluating POTS and orthostatic intolerance. During the test, the patient lies on a special table while heart rate and blood pressure are monitored. The table is then tilted upright to simulate standing while measurements continue.

This allows clinicians to observe:

Heart rate response
Blood pressure response
Timing of symptoms
Whether symptoms match physiologic changes
Whether fainting or near fainting occurs
Whether findings suggest POTS, vasovagal syncope, orthostatic hypotension, or another pattern

POTS UK notes that tilt testing typically involves lying flat followed by head-up tilt, with continuous heart rate and blood pressure monitoring.

Why Neurologic Evaluation Matters

POTS is often discussed as a heart rate problem, but it is fundamentally tied to autonomic nervous system regulation. Neurologists evaluate how the nervous system controls circulation, sweating, sensation, reflexes, balance, and alertness.

At CNS, this neurologic perspective helps identify whether symptoms may be related to:

Autonomic neuropathy
Small fiber neuropathy
Migraine-associated dysautonomia
Post-viral dysautonomia
Medication effects
Syncope syndromes
Neuropathy or nerve dysfunction
Central nervous system disorders

This matters because treatment should be personalized. Two patients may both meet criteria for POTS but have different underlying drivers.

Conditions That Can Look Like POTS

POTS testing is also valuable because it helps rule out other causes of dizziness and tachycardia.

Conditions that may mimic or overlap with POTS include:

Orthostatic hypotension
Vasovagal syncope
Cardiac arrhythmia
Anemia
Thyroid disease
Dehydration
Medication side effects
Adrenal disorders
Anxiety or panic disorder
Vestibular disorders
Chronic fatigue syndrome
Long COVID
Migraine
Ehlers-Danlos syndrome
Small fiber neuropathy

A correct diagnosis prevents unnecessary treatment and helps patients move forward with a plan that fits their physiology.

POTS and Long COVID

Since the COVID pandemic, more patients have reported post-viral dizziness, tachycardia, fatigue, brain fog, and exercise intolerance. Some of these patients meet criteria for POTS or another form of dysautonomia.

Post-viral autonomic dysfunction is not new, but long COVID has increased awareness of how infections can affect the autonomic nervous system. Patients may notice that before the illness they were active and functional, but afterward they struggle to stand, walk, exercise, or concentrate.

For these patients, autonomic testing can provide validation and direction. It can also help distinguish POTS from deconditioning alone.

POTS, Migraine, and Brain Fog

POTS frequently overlaps with migraine and cognitive symptoms. Many patients describe “brain fog” as one of the most frustrating parts of the condition. They may have trouble concentrating, remembering words, working at a computer, or completing school or job tasks.

Brain fog in POTS may be related to reduced blood flow regulation when upright, sleep disruption, fatigue, migraine activity, or autonomic instability. At CNS, patients can also be evaluated for headache disorders, migraine treatment needs, neuropathy symptoms, and other neurologic contributors.

This is important for local SEO and patient care because many people searching for migraine treatment Phoenix AZ, headache specialist Phoenix, memory clinic Phoenix, or dizziness specialist Arizona may actually have overlapping autonomic dysfunction.

How POTS Is Treated After Diagnosis

POTS treatment is individualized. There is no single treatment that works for every patient. A good plan usually combines lifestyle strategies, physical conditioning, trigger management, and sometimes medication.

A 2021 review on POTS notes that management typically begins with education and non-pharmacologic treatment; medications are used for specific symptoms, but there are currently no FDA-approved medications specifically for POTS.

Common non-medication strategies include:

Increasing fluids when appropriate
Increasing salt intake when medically appropriate
Compression socks or abdominal compression
Avoiding prolonged standing
Heat avoidance
Slow position changes
Smaller, more frequent meals
Graded recumbent exercise
Sleep optimization
Trigger tracking

Medication options may be considered depending on the patient’s blood pressure, heart rate, symptoms, and comorbid conditions. The right medication plan depends on accurate diagnosis and careful follow-up.

Living With POTS in Arizona

Arizona creates unique challenges for patients with POTS. Heat is one of the most common symptom triggers. When temperatures rise, blood vessels dilate, sweating increases, and dehydration risk goes up. For someone with autonomic dysfunction, this can worsen dizziness, palpitations, weakness, and fainting risk.

Arizona POTS tips include:

Hydrate before leaving home
Avoid outdoor activity during peak heat
Use cooling towels or cooling vests
Plan errands early in the morning
Carry electrolyte fluids if recommended
Use shade and air conditioning strategically
Avoid standing in long outdoor lines
Be cautious after hot showers
Discuss salt intake with your physician before increasing it

Patients in Phoenix, Scottsdale, Tempe, Mesa, Chandler, Gilbert, Glendale, Peoria, Paradise Valley, and Ahwatukee often notice that symptoms worsen during summer months. A local treatment plan should account for that.

When to Seek POTS Testing

You should consider POTS testing if your symptoms are persistent, positional, or interfering with daily life.

Testing may be appropriate if you experience:

Dizziness most days
Rapid heart rate with standing
Repeated near fainting
Unexplained fatigue
Brain fog that worsens upright
Exercise intolerance
Symptoms after viral illness
Symptoms worse in heat
Normal cardiac testing but ongoing symptoms
A previous suggestion that symptoms are “just anxiety” but they feel clearly physical

The earlier the diagnosis, the sooner treatment can begin.

Why Patients Choose CNS for POTS Diagnosis in Phoenix

Center for Neurology & Spine offers neurologist-led autonomic evaluation in Phoenix for patients seeking a more complete explanation of their symptoms.

Patients choose CNS because of:

Mayo-trained neurologists
POTS testing in Phoenix
Autonomic testing Arizona
Tilt table testing capability
Neurologic interpretation of complex symptoms
Care for overlapping migraine, neuropathy, dizziness, and brain fog
Personalized treatment planning

Dr. Leslie Zuniga and Dr. Rebecca Jones bring specialized neurologic expertise to patients who need clarity, validation, and a practical path forward.

Frequently Asked Questions About POTS Testing in Phoenix

What is POTS?

POTS is a disorder of the autonomic nervous system where heart rate rises abnormally when standing, often causing dizziness, palpitations, fatigue, brain fog, and exercise intolerance.

How is POTS diagnosed?

POTS is diagnosed through symptoms plus objective heart rate and blood pressure changes during standing or tilt table testing. Adults typically show a sustained heart rate increase of at least 30 beats per minute within 10 minutes of standing, without significant orthostatic hypotension.

Is POTS a heart problem or a nervous system problem?

POTS affects heart rate, but it is usually considered a disorder of autonomic nervous system regulation. That is why neurologic evaluation can be important.

Can POTS cause brain fog?

Yes. Many patients with POTS report brain fog, difficulty concentrating, mental fatigue, and reduced work or school performance, especially when upright.

Can anxiety cause POTS?

Anxiety does not cause the diagnostic heart rate pattern of POTS, although anxiety and POTS can coexist. Testing helps clarify the difference.

Is POTS dangerous?

POTS is usually not life-threatening, but it can be disabling and significantly affect quality of life.

Can POTS improve?

Many patients improve with accurate diagnosis, education, lifestyle changes, physical conditioning, trigger management, and individualized medical care.

Does Arizona heat make POTS worse?

Yes. Heat can worsen symptoms by increasing vasodilation and dehydration risk, making it harder for the body to maintain circulation while standing.

How do I schedule POTS testing at CNS?

Contact Center for Neurology & Spine through cnsofaz.com or call the office to ask about POTS testing, autonomic testing, or tilt table evaluation in Phoenix.

Schedule POTS Testing in Phoenix, Arizona

If you are struggling with dizziness, rapid heartbeat, fainting, palpitations, fatigue, brain fog, or exercise intolerance, you do not have to keep searching without answers.

Center for Neurology & Spine now offers POTS testing in Phoenix, Arizona for patients who need a comprehensive evaluation of autonomic symptoms. Our Mayo-trained neurologists, Dr. Leslie Zuniga and Dr. Rebecca Jones, provide expert neurologic care for patients across Phoenix and the Valley.

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

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