Is It POTS, Anxiety, Vertigo, Syncope, or a Heart Problem

Dizziness and rapid heartbeat can be confusing symptoms. One patient may feel lightheaded when standing. Another may feel their heart race after a shower. Someone else may nearly faint in a grocery store line, while another person feels weak, shaky, foggy, and exhausted after walking across a parking lot in the Phoenix heat.

These symptoms are often grouped together under vague labels such as anxiety, dehydration, vertigo, stress, or fatigue. Sometimes those explanations are correct. But sometimes they miss the real problem.

One possible cause is Postural Orthostatic Tachycardia Syndrome, also known as POTS. POTS is a disorder of the autonomic nervous system, the part of the nervous system that regulates heart rate, blood pressure, circulation, sweating, digestion, and temperature control.

At Center for Neurology and Spine in Phoenix, Arizona, we offer POTS testing and autonomic evaluation for patients with unexplained dizziness, rapid heartbeat, fainting, palpitations, fatigue, brain fog, weakness, and exercise intolerance. Patients are evaluated by Mayo-trained neurologists Dr. Leslie Zuniga and Dr. Rebecca Jones, who specialize in identifying complex neurological and autonomic causes of persistent symptoms.

If you are searching for POTS testing Phoenix, autonomic testing Arizona, tilt table testing Phoenix, neurologist for POTS, dizziness specialist Phoenix, or POTS diagnosis near me, this guide explains how POTS differs from other common diagnoses and why objective testing matters.

Why Dizziness and Rapid Heartbeat Are So Often Misdiagnosed

Dizziness is one of the most common symptoms in medicine. It can come from the brain, inner ear, heart, blood pressure, blood sugar, hydration status, medications, anxiety, or the autonomic nervous system. Because so many systems can produce similar symptoms, patients may be passed from one specialist to another without a clear answer.

A person with POTS may have:

Normal blood work
Normal EKG
Normal echocardiogram
Normal brain imaging
Normal exam while sitting
Normal blood pressure at rest

But symptoms may appear when the person stands, stays upright, gets overheated, eats a large meal, showers, or tries to exercise.

This is why position-based testing is important. POTS may not show up during a routine seated office visit. It often becomes visible only when heart rate and blood pressure are measured during posture change.

POTS Versus Anxiety

POTS and anxiety can feel similar. Both can cause a racing heart, shakiness, chest discomfort, shortness of breath, sweating, and a sense that something is wrong.

The difference is that POTS symptoms are often triggered by standing and improve when lying down. A person may feel calm emotionally but still develop tachycardia when upright. Anxiety symptoms may occur in many situations and are not necessarily tied to posture.

POTS is not diagnosed based on feelings alone. It is diagnosed by combining symptoms with objective heart rate and blood pressure measurements during standing or tilt table testing.

A patient with POTS may say:

My heart races when I stand, even when I am not anxious.

I feel better lying down.

I get dizzy in the shower or while standing in line.

My symptoms are worse in the heat.

I was told it was anxiety, but my heart rate jumps every time I stand.

Anxiety can also develop secondarily because unpredictable physical symptoms are stressful. A patient may have both POTS and anxiety. Testing helps clarify whether autonomic dysfunction is present so treatment can address the right problem.

POTS Versus Vertigo

Vertigo is the sensation that the room is spinning or moving. It often comes from the inner ear or vestibular system. POTS usually causes lightheadedness, faintness, weakness, shakiness, or a sense that blood is draining from the head when upright.

Vertigo symptoms may worsen with head movement, rolling over in bed, or looking up. POTS symptoms usually worsen with standing, heat, prolonged upright posture, dehydration, or exertion.

A patient with vertigo may say:

The room spins when I turn my head.

I feel worse when I roll over in bed.

My balance feels off even while lying down.

A patient with POTS may say:

I feel faint when I stand.

My heart rate jumps upright.

I need to sit or lie down to recover.

I feel worse after standing still.

Some patients have both vestibular issues and POTS. This is especially common in patients with migraine, concussion history, or chronic dizziness. A neurologic evaluation can help identify whether symptoms are vestibular, autonomic, migraine-related, or mixed.

POTS Versus Vasovagal Syncope

Vasovagal syncope is a common cause of fainting. It happens when the nervous system triggers a sudden drop in heart rate, blood pressure, or both. Patients may faint after pain, fear, standing too long, dehydration, blood draws, overheating, or emotional stress.

POTS and vasovagal syncope can overlap, but they are not the same.

In POTS, the main issue is excessive heart rate increase with upright posture. In vasovagal syncope, the key event is often a reflex drop in blood pressure or heart rate that leads to fainting.

Symptoms before vasovagal syncope may include:

Nausea
Sweating
Pale skin
Tunnel vision
Warmth
Yawning
Lightheadedness
Slow or dropping pulse before fainting

Symptoms in POTS may include:

Rapid heartbeat
Palpitations
Shakiness
Brain fog
Weakness
Fatigue
Exercise intolerance
Lightheadedness that may or may not lead to fainting

Tilt table testing can help distinguish these patterns by showing what happens to heart rate and blood pressure before symptoms occur.

POTS Versus Orthostatic Hypotension

Orthostatic hypotension means blood pressure drops significantly when standing. It can cause dizziness, fainting, weakness, blurry vision, and falls.

POTS is different because the heart rate rises significantly without the same degree of blood pressure drop required for orthostatic hypotension.

This distinction matters because treatment may differ. Patients with orthostatic hypotension may need evaluation for medication effects, dehydration, autonomic neuropathy, Parkinsonian disorders, diabetes, or other causes of impaired blood pressure regulation.

POTS testing helps answer an important question:

Is the heart rate rising too much
Is the blood pressure dropping too much
Or are both happening together

POTS Versus Cardiac Arrhythmia

A cardiac arrhythmia is an abnormal heart rhythm. Arrhythmias can cause palpitations, dizziness, chest discomfort, shortness of breath, fainting, or rapid heart rate.

Many POTS patients undergo cardiology testing before seeing a neurologist. That is appropriate when symptoms include palpitations or fainting. EKGs, Holter monitors, event monitors, and echocardiograms can help rule out structural heart disease or rhythm disorders.

However, a normal cardiac workup does not rule out POTS. POTS is often not a primary rhythm disorder. The rhythm may be sinus tachycardia, meaning the heart is beating fast in response to autonomic and circulatory changes rather than an abnormal electrical rhythm.

A patient with POTS may have a normal heart rhythm but an abnormal heart rate response to standing.

This is one reason autonomic testing can be helpful after cardiac causes have been ruled out.

POTS Versus Dehydration

Dehydration can cause dizziness and rapid heartbeat. It can also make POTS worse. But dehydration alone should improve when fluids are restored.

POTS may persist despite reasonable hydration and may follow a consistent posture-related pattern.

Patients often notice symptoms worsen with:

Heat
Sweating
Illness
Alcohol
Low fluid intake
Long standing
Skipping meals

In Arizona, dehydration can amplify POTS symptoms quickly. But when symptoms continue even after hydration is improved, autonomic testing may be needed.

POTS Versus Chronic Fatigue

Fatigue is one of the most disabling symptoms of POTS. Many patients feel exhausted after basic activities. Some are told they have chronic fatigue, deconditioning, or stress.

The difference is that POTS fatigue often worsens with upright posture and exertion. A person may feel dramatically better lying down. They may also notice their heart rate rises disproportionately with simple activity.

POTS and chronic fatigue syndrome can overlap. Some patients meet criteria for both. Testing helps identify whether orthostatic intolerance is contributing to fatigue and brain fog.

Why Neurologists Evaluate POTS

POTS affects heart rate, but it is closely tied to the nervous system. The autonomic nervous system controls blood vessel tone, heart rate regulation, sweating, digestion, temperature control, and blood pressure responses.

Neurologists evaluate whether symptoms may be caused by:

Autonomic dysfunction
Small fiber neuropathy
Migraine-related dysautonomia
Post-viral dysautonomia
Neuropathy
Central nervous system disorders
Medication effects
Syncope syndromes
Overlapping neurologic conditions

At CNS, POTS testing is interpreted in the context of the whole patient, not just one heart rate number.

How Autonomic Testing Helps

Autonomic testing measures how the body responds to posture change and physiologic stress. It helps identify whether symptoms match a measurable autonomic pattern.

Testing may include:

Orthostatic vital signs
Tilt table testing
Heart rate monitoring
Blood pressure monitoring
Valsalva maneuver testing
Heart rate variability testing
Sudomotor testing when appropriate
Neurological examination
Review of medications and triggers

The goal is to identify the pattern behind symptoms.

Possible findings may include:

POTS
Vasovagal syncope
Orthostatic hypotension
Delayed orthostatic intolerance
Autonomic neuropathy pattern
Normal autonomic response
Mixed findings requiring broader evaluation

A normal result does not mean symptoms are fake. It means the testing did not show that specific abnormality at that time, and other causes should be considered.

What Makes Tilt Table Testing Useful

Tilt table testing is helpful because it creates a controlled change in posture while heart rate, blood pressure, and symptoms are monitored.

During the test, the patient is secured on a special table. The table moves from lying down to an upright angle. The team monitors the cardiovascular response and records symptoms.

Tilt table testing can help answer:

Does heart rate rise excessively
Does blood pressure fall
Do symptoms match the physiologic changes
Does the pattern suggest POTS
Does the pattern suggest vasovagal syncope
Does the pattern suggest orthostatic hypotension

This information can help patients move from uncertainty to a clearer diagnosis.

Who Should Consider POTS Testing

POTS testing may be appropriate if you have:

Dizziness when standing
Rapid heartbeat with posture change
Palpitations when upright
Fainting or near fainting
Brain fog that worsens upright
Fatigue after standing or activity
Exercise intolerance
Symptoms worse in heat
Symptoms after COVID or another illness
Normal cardiac testing but ongoing symptoms
Symptoms dismissed as anxiety despite a posture-related pattern

Testing is especially important when symptoms interfere with work, school, driving, exercise, or daily life.

What Happens After a Diagnosis

Once a diagnosis is made, treatment focuses on improving function and reducing symptom flares.

Treatment may include:

Education about triggers
Fluid optimization
Salt guidance when medically appropriate
Compression garments
Heat avoidance
Gradual exercise conditioning
Sleep support
Migraine treatment if present
Medication review
Heart rate or blood pressure medications in selected cases
Follow-up monitoring

Treatment should be individualized. POTS can look different from patient to patient, and management should be based on the patient’s blood pressure pattern, heart rate response, symptoms, medical history, and lifestyle.

Why Arizona Patients Need Climate-Specific POTS Care

Phoenix heat can worsen orthostatic intolerance. Heat dilates blood vessels and increases sweating, which can worsen blood pooling and dehydration.

Arizona patients may need practical strategies such as:

Scheduling errands early
Avoiding outdoor lines
Using cooling towels
Hydrating before leaving home
Avoiding hot showers
Planning indoor exercise
Using compression if recommended
Being cautious during summer travel

A treatment plan that ignores Arizona climate may fail in real life.

Why Choose Center for Neurology and Spine

Center for Neurology and Spine offers POTS testing and autonomic evaluation in Phoenix for patients with dizziness, rapid heartbeat, fainting, fatigue, palpitations, brain fog, and exercise intolerance.

Patients choose CNS because of:

Mayo-trained neurologists
POTS testing in Phoenix
Autonomic testing in Arizona
Tilt table testing
Neurologic interpretation of complex symptoms
Evaluation for overlapping migraine, neuropathy, and syncope
Personalized treatment planning

Dr. Leslie Zuniga and Dr. Rebecca Jones provide specialized neurologic care for patients across Phoenix, Scottsdale, Tempe, Mesa, Chandler, Gilbert, Glendale, Peoria, Paradise Valley, Ahwatukee, and surrounding areas.

Frequently Asked Questions

How do I know if dizziness is POTS?

POTS symptoms usually worsen when standing and improve when lying down. Testing measures heart rate and blood pressure changes during posture change.

Can POTS be mistaken for anxiety?

Yes. POTS can feel like anxiety because both may cause rapid heartbeat and shakiness. Autonomic testing can help show whether symptoms are posture-related.

Can POTS cause vertigo?

POTS usually causes lightheadedness rather than true spinning vertigo, but patients can have both POTS and vestibular problems.

Can a normal EKG rule out POTS?

No. Many patients with POTS have normal EKGs. POTS is diagnosed by the body’s response to standing or tilt testing.

What does tilt table testing show?

Tilt table testing shows how heart rate, blood pressure, and symptoms change when the body moves from lying down to upright positioning.

Is POTS dangerous?

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

Can POTS be treated?

Yes. Many patients improve with hydration strategies, compression, exercise conditioning, trigger management, medication when appropriate, and follow-up care.

Does CNS offer POTS testing in Phoenix?

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

Schedule POTS Testing in Phoenix

If you have dizziness, rapid heartbeat, palpitations, fainting, fatigue, brain fog, or exercise intolerance, and you are not getting answers, POTS testing may help clarify what is happening.

Center for Neurology and Spine offers neurologist-led POTS testing and autonomic evaluation in Phoenix for patients across the Valley.

Visit cnsofaz.com to request an appointment.

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