What Is POTS? Symptoms, Causes, and Vein Health

For most people, standing up is something the body handles without a second thought. For people with postural orthostatic tachycardia syndrome (POTS), it can feel like a system failure. The heart races. The room tilts. A wave of exhaustion arrives before you've taken a single step. 

These symptoms are real, measurable, and have a physiological explanation rooted in how your body manages blood flow. Yet many people with POTS spend years being told their labs look fine, and nothing is wrong. The reality is that this condition is far more common and far more commonly missed than most people, including many physicians, realize. 

According to Johns Hopkins Medicine, POTS affects an estimated one to three million Americans. Despite its prevalence, survey data from Dysautonomia International confirms that the average diagnostic delay is nearly six years, with 69 percent of patients being told they have an anxiety disorder before receiving the correct diagnosis.

Getting the right diagnosis is the first step. Understanding what is happening in your body is the next step. 

We consulted Center for Vein Restoration (CVR) vein physician and cardiologist, Michael L. Aikens, MD, to help us break down what POTS is in plain language, explain why it is fundamentally a circulatory condition, and help you understand why vein health may play a bigger role in your symptoms than anyone has told you yet.

Dr. Aikens is the lead physician at CVR vein clinic locations in Opelika, Alabama, and Montgomery, Alabama.

CVR is America's largest physician-led vein center and offers comprehensive treatment for chronic venous insufficiency. With 120+ centers in 22 states nationwide, there’s sure to be a Center for Vein Restoration near you.

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What is POTS?

Postural orthostatic tachycardia syndrome is a condition that causes your heart to beat faster than normal when you move from sitting or lying down to standing. Each word in the name is meaningful: "postural" refers to body position, "orthostatic" means related to standing upright, "tachycardia" means a heart rate above 100 beats per minute, and "syndrome" means a group of symptoms that occur together.

POTS is one of the most common forms of orthostatic intolerance, the umbrella term for conditions in which the body struggles to adjust properly when moving from a lying or seated position to an upright position. 

According to the Cleveland Clinic, the distinguishing feature of POTS is that the heart rate spikes dramatically upon standing, even when blood pressure does not drop significantly, which distinguishes it from other forms of orthostatic intolerance.

In adults, POTS is clinically defined as a heart rate increase of 30 or more beats per minute within the first 10 minutes of standing. According to the National Library of Medicine, POTS predominantly affects premenopausal females at roughly a five-to-one ratio compared to males, most commonly between the ages of 15 and 50, and presents with fatigue, headache, palpitations, sleep disturbance, nausea, and bloating. 

The hallmark experience patients describe is feeling completely fine lying down, then standing up, only to feel their body suddenly struggle to keep up.

POTS Is a Circulatory Problem First

When you stand up, gravity pulls blood downward. Healthy veins and a well-functioning autonomic nervous system work together to push that blood back up toward the heart. In many people with POTS, that system breaks down. Blood pools in the lower extremities, less blood reaches the heart, and the heart compensates by beating faster to maintain adequate circulation to the brain.

According to research published in PubMed Central, during positional changes, blood accumulates in the lower extremities, and venous return to the heart declines, directly causing dizziness, palpitations, and fatigue that define the condition. The elevated heart rate is the body's attempt to compensate for what the venous system is failing to do on its own.

This is why POTS is not simply a heart condition or a nervous system condition in isolation. At its core, it is a problem of blood flow, and for many patients, the veins in the legs are central to that problem.

Are you living with POTS and still struggling with leg pain, swelling, or heaviness that isn't improving? A vein evaluation at Center for Vein Restoration may provide answers your other providers have not yet explored. 

The Venous Insufficiency Connection

Researchers are increasingly documenting a meaningful overlap between POTS and venous insufficiency, the same underlying condition responsible for varicose veins and spider veins.

In the neuropathic subtype of POTS, reduced nerve signaling to the veins in the lower limbs means those veins cannot contract properly, so blood settles in the legs rather than returning to the heart. According to the National Library of Medicine, this can sometimes be visible as a bluish discoloration of the lower legs and feet when standing, a sign that blood is pooling rather than circulating.

A 2024 study published in the European Heart Journal Case Reports described four POTS patients with confirmed venous reflux on duplex ultrasound who were not improving with conventional treatment. All four underwent radiofrequency ablation, a minimally invasive outpatient vein procedure, and each reported improvement in their POTS symptoms and quality of life afterward. The researchers concluded that POTS patients who are not responding to standard management should be evaluated for venous insufficiency.

A separate 2024 study published in the Journal of the American College of Cardiology further examined the prevalence of lower extremity venous insufficiency in POTS patients, adding to a growing body of evidence connecting the two conditions.

POTS is a complex condition with multiple subtypes, and venous insufficiency is not the cause in every case. But for patients with leg pain, swelling, heaviness, or visible vein changes, a vein evaluation may uncover a circulatory component that has not yet been addressed.

👉  Book your consultation with a CVR vein specialist today and discover what relief can look like.

Why Compression Therapy Works, and What It Tells Us About POTS

One of the clearest signals that vein health is central to POTS is that compression therapy, the same frontline treatment used for venous insufficiency and varicose veins, is also a primary recommendation for managing POTS symptoms.

According to the National Library of Medicine, reducing venous pooling through graduated compression garments is a core non-medication treatment recommendation for POTS, alongside increasing fluid and salt intake. 

Compression stockings work by applying external pressure to the lower legs, helping the veins move blood upward rather than allowing it to pool. Many patients find that wearing them consistently makes a meaningful difference in their daily symptom burden.

Signs That a Vein Evaluation May Help You

If you have POTS and are experiencing any of the following symptoms, it’s time to visit a board-certified CVR vein specialist:

• Your legs feel heavy, achy, or tired when you have been upright for any length of time
• You notice swelling in your ankles or calves that worsens throughout the day
• You have visible varicose veins or spider veins that are new or worsening
• Your lower legs or feet take on a bluish or purplish color when you are standing
• Your POTS symptoms are not well controlled with standard lifestyle approaches
• You have previously been told you have venous reflux or poor circulation

Venous insufficiency can occur entirely beneath the skin's surface, with no visible signs. A duplex ultrasound, a quick, painless, non-invasive scan, is the standard way to evaluate blood flow in the veins of the legs and can identify reflux and pooling that a physical exam would never reveal.

You Deserve Answers. CVR Is Here to Help.

Living with POTS is exhausting enough without spending years wondering whether something is being missed. If your legs ache, swell, or feel heavy, if compression helps but never quite solves the problem, if you have a POTS diagnosis but still don't feel like you have the full picture, your vein health deserves a closer look.

A CVR vein evaluation starts with a non-invasive duplex ultrasound that maps blood flow through the veins of your legs. If venous reflux or insufficiency is present, your board-certified CVR physician will walk you through your vein treatment options, all of which are minimally invasive, performed in-office, and require little to no downtime. 

CVR accepts many major insurance plans, including Medicare and Medicaid, for medically necessary vein treatment.

Frequently Asked Questions

1. Can POTS be caused by varicose veins or venous insufficiency? Venous insufficiency does not directly cause POTS, but both conditions share the same core problem: blood pooling in the legs that prevents adequate circulation when you are upright. Research published in the European Heart Journal Case Reports found that POTS patients with confirmed venous reflux reported meaningful symptom improvement after receiving radiofrequency ablation.
2. Why does my heart race when I stand up? When blood pools in your legs instead of returning to your heart, your body responds by driving your heart rate up to maintain blood flow to the brain. This compensatory response is the defining physiological feature of POTS and is directly tied to how effectively blood moves through your venous system when you change positions.
3. Do I need visible varicose veins or spider veins to have venous insufficiency? No. Venous insufficiency can exist entirely beneath the skin with no visible signs. A duplex ultrasound performed by a board-certified vein specialist can identify venous reflux and pooling that a physical exam would never detect.
4. What vein treatments are available, and are they safe for someone with POTS? Minimally invasive options, including radiofrequency ablation, endovenous laser ablation, and sclerotherapy, are outpatient procedures requiring no general anesthesia and minimal recovery time. Current evidence suggests these treatments are well-tolerated and may offer meaningful circulatory benefit for POTS patients with confirmed venous reflux, ideally in coordination with their broader care team.
5. Is POTS a permanent condition? Outcomes vary based on the underlying cause, age of onset, and the extent of management. Still, according to Johns Hopkins Medicine, most patients see meaningful improvement with a combination of diet, medication, and physical therapy. For patients with a venous component, treating the underlying vein disease may provide additional, sustained relief that lifestyle changes alone cannot achieve.