POTS: A Cardiologist's Guide to Postural Orthostatic Tachycardia Syndrome

The college student in my exam room had been told twice that her racing heart was anxiety. Her story never changed. She would stand up, her heart would take off, the edges of the room would go gray, and she would have to sit back down. Lying flat, she felt close to normal. Her smartwatch had already caught the pattern, resting rates in the 70s, then 130s within a few minutes of being on her feet. She is a composite of several patients I’ve seen over the years, details changed as always, but the arc is one I could recite in my sleep. Months of symptoms. Several visits. A label of anxiety that never quite fit. Then a ten-minute standing test in my office that finally gave the whole thing a name.

That name is postural orthostatic tachycardia syndrome, or POTS. It’s a disorder of the autonomic nervous system, the wiring that quietly runs your blood pressure and heart rate in the background without any input from you. When a healthy person stands, gravity pulls a good portion of their blood down toward the legs and belly. Your autonomic system responds in a heartbeat, squeezing blood vessels and nudging the heart rate up a few beats, and the moment passes unnoticed. In POTS, that reflex misfires. The blood vessels down low don’t clamp the way they should, blood pools, less returns to the heart, and the heart compensates the only way it can. It races.

This article covers what POTS is, how I diagnose it in clinic, what the treatment actually looks like day to day, and what patients can expect over time. My goal is for you to walk away understanding your own diagnosis, or recognizing a syndrome that has gone unnamed in you or someone you love.

What POTS Is, in Numbers

POTS has a precise definition, and the precision helps, since so many patients arrive after years of vague labels. Three things have to be true.

First, your heart rate rises by at least 30 beats per minute within 10 minutes of standing, and stays up. For adolescents between 12 and 19, the bar is higher, at least 40 beats per minute, since healthy teenagers have livelier reflexes.

Second, your blood pressure does not drop much when you stand. A sustained fall of 20 points or more in the top (systolic) number is a different condition called orthostatic hypotension, which has its own workup and treatment. POTS is a heart rate problem on standing, with blood pressure that holds roughly steady.

Third, you’ve had symptoms of orthostatic intolerance for at least three to six months. Lightheadedness on standing, a pounding or racing heart, brain fog, fatigue, shakiness, blurred vision, sometimes nausea, all of it better when you lie down. A bad week after the flu doesn’t qualify. A bad year does.

Somewhere between 0.2 and 1 percent of people meet these criteria, which makes POTS far more common than most people assume, physicians included. Roughly 80 to 90 percent of patients are women, most between 15 and 45. Onset frequently follows a stressor. A viral infection is the classic one, and long COVID has pushed a wave of new POTS diagnoses into clinics like mine. Surgery, pregnancy, physical trauma, and concussion show up as triggers too. Many patients can name the month their body changed.

One thing I say early in every one of these visits, because patients carry more fear than they admit. POTS is miserable, and it is not dangerous. It does not damage the heart muscle, and it is not life-threatening. The racing heart is a normal heart responding to an abnormal signal. That distinction changes everything about how we treat it.

Why Standing Makes You Feel So Bad

POTS is a syndrome, a pattern of symptoms with several underlying mechanisms that overlap in the same patient. Sorting out which mechanisms dominate helps guide treatment, so it’s worth understanding the three main flavors.

Neuropathic POTS involves partial damage to the small autonomic nerve fibers that tell blood vessels in the legs and belly to constrict. Signals to squeeze go out, the vessels down low don’t fully answer, and blood pools where gravity wants it. The heart races to keep blood moving to the brain.

Hyperadrenergic POTS is the overdrive version. The sympathetic nervous system, your fight-or-flight branch, fires excessively on standing. Blood levels of norepinephrine, the main fight-or-flight chemical, often climb to 600 picograms per milliliter or higher upright, and patients feel it. Pounding heart, tremor, sweating, a surge of anxiety-like arousal that is chemical, coming from the body’s own adrenaline system. Up to half of POTS patients have a hyperadrenergic component, and these are the patients most often mislabeled as having a psychiatric problem.

Hypovolemic POTS means the tank is low. Some patients with POTS run a measurably reduced blood and plasma volume, and a fast heart rate is the natural compensation for an underfilled circulation.

These categories blur together, and most patients have features of more than one. Alongside them run a set of associated conditions worth knowing about. Joint hypermobility and Ehlers-Danlos syndrome travel with POTS often enough that I examine joints in young patients with orthostatic symptoms. Some patients have autoimmune or immune-mediated features, and some have mast cell activation symptoms, with flushing and hive-like episodes alongside the racing heart. Deconditioning deserves its own mention. It rarely causes POTS by itself, but weeks in bed feeling terrible make every mechanism above worse, and the spiral of symptoms leading to rest leading to worse symptoms is real. Breaking that spiral is half the treatment plan.

How I Make the Diagnosis

Diagnosing POTS is simpler than most patients expect, and the most useful test costs nothing.

It starts with the story and a physical exam. Then comes the standing test, which I like to see done carefully. You lie down for several minutes and we record heart rate and blood pressure. Then you stand, still and quiet, and we recheck both at intervals over 10 minutes. A sustained rise of 30 beats per minute or more, with blood pressure holding steady, in a patient whose symptoms reproduce on their feet, makes the diagnosis. I check these vitals myself when the story sounds like POTS, since a single reading at one minute misses the sustained pattern, and that sustained pattern is the diagnosis.

Every patient gets a 12-lead EKG to look at the baseline rhythm and screen for anything structural hiding underneath. From there, testing is targeted at the mimics, because plenty of conditions produce a fast heart rate on standing and they need different treatment. Anemia. Dehydration. Fever. An overactive thyroid. Certain medications, including stimulants, decongestants, and some antidepressants that block norepinephrine reuptake. Anxiety with hyperventilation. And the rare zebra, a pheochromocytoma, an adrenaline-producing tumor we screen for when the picture includes spells of severe hypertension. Bloodwork covering thyroid function and a blood count handles most of this list. When the picture stays murky, an echocardiogram, a wearable heart monitor, or an exercise test fills in the gaps. My article on palpitations walks through how I think about racing-heart complaints more broadly.

A tilt table test earns its keep when the office standing test is normal or borderline and the story still points hard at POTS. The tilt table holds you upright at a fixed angle with continuous beat-to-beat monitoring, and some experts consider it the reference standard for documenting the heart rate pattern. Most of my patients never need one, since the diagnosis usually declares itself in the office.

What about the fancier tests you may have read about in POTS forums, sweat testing, standing catecholamine levels, 24-hour urine sodium? Those belong at specialized autonomic centers, reserved for patients whose diagnosis stays uncertain or whose symptoms resist standard treatment. They are not part of the routine workup, and chasing them early adds cost and delay without changing the first year of treatment.

If your main symptom is actually passing out, or nearly passing out, start with my article on lightheadedness versus syncope. Fainting has its own decision tree, and POTS patients feel faint far more often than they actually faint.

Treatment Starts Without a Prescription Pad

No medication is FDA-approved for POTS. Everything we prescribe is off-label, borrowed from other conditions, with modest effect sizes in studies. I tell patients this up front, since it reframes the plan. The foundation of POTS treatment is not a pill. It’s volume, compression, and retraining the body, with medications layered on top for what remains.

Volume comes first. I ask for two to three liters of fluid a day, spread across the day, and a deliberate increase in salt, on the order of 10 to 12 grams of salt (sodium chloride) daily for most patients, using salt tablets when food alone can’t get there. That number startles people who have spent their lives hearing salt is the enemy. In POTS the logic flips. Salt holds water in the bloodstream, an expanded blood volume blunts the pooling, and the heart doesn’t have to race as hard. Patients with high blood pressure, kidney disease, or heart failure need a different conversation, which is one of several reasons this plan should be built with your own physician.

Compression garments do quiet, unglamorous work. The blood that pools in POTS sits mostly in the belly and pelvis, so an abdominal binder or waist-high compression garments outperform the knee-high stockings most people picture. Patients who try real compression are usually surprised by how much it helps on a long day upright.

Just as much of the plan is subtraction. Long stretches of bedrest make POTS worse, sometimes dramatically, so I push patients to stay as upright and active as symptoms allow even on bad days. Medications that block norepinephrine reuptake, found among certain antidepressants and ADHD medications, can amplify the standing heart rate, and I comb through the med list of every new POTS patient looking for them.

Exercise Is the Cornerstone, and the Hardest Sell

Every guideline puts structured exercise reconditioning at the center of POTS treatment, and it carries the strongest recommendation of any intervention we have. It’s also the recommendation patients trust least, since exercise is often the exact thing that flattens them.

The trick is where you start. Upright exercise early on is a setup for failure. Programs that work begin recumbent, on a rowing machine, a recumbent bike, or in a pool, where gravity isn’t fighting you, paired with resistance work for the legs and core, the muscles that squeeze blood back up toward the heart. Over weeks to months, the sessions build, and upright exercise gets folded in gradually. Progress is slow, grinding work, and the early weeks can feel worse before they feel better. I warn patients about that window so they don’t quit inside it.

I’ve watched this succeed enough times to push hard for it. One of my patients, another composite, spent a year mostly housebound before committing to a recumbent program. Eight months later she walked into clinic having driven herself there, annoyed mostly that her compression leggings didn’t fit her new quads. Recovery stories in POTS tend to sound like that. Not a miracle drug. A long, boring, stubborn climb.

Medications, and How I Choose Among Them

Medications enter the plan when fluids, salt, compression, and a real attempt at reconditioning leave symptoms behind. Often the best use of a medication is as a bridge, calming the physiology enough that the exercise program becomes possible. Which drug I reach for depends on which mechanism seems to dominate.

Fludrocortisone expands blood volume by helping the kidneys hold onto the salt you’re eating. Typical dosing is 0.1 to 0.2 milligrams daily alongside the high-salt diet. It can drop potassium levels, so I check bloodwork after starting it, and I avoid it in patients prone to fluid overload.

Midodrine squeezes blood vessels directly, attacking the pooling problem at its source. It’s dosed 2.5 to 10 milligrams three times daily, and the schedule has a quirk that trips people up. Its last dose belongs in the late afternoon, and lying down soon after a dose can push blood pressure too high, so it’s a daytime-only, upright-hours drug. Patients who pool visibly, whose feet turn dusky purple after a few minutes of standing, tend to do well with it.

Propranolol at low doses, 10 to 20 milligrams, takes the edge off the standing heart rate and the pounding sensation. The dose is the entire story here. Higher doses of beta-blockers usually make POTS patients feel worse, more fatigued and more exercise-intolerant, so this is a place where more medicine means worse results. It’s a natural fit for hyperadrenergic patients.

Ivabradine slows the sinus node, the heart’s natural pacemaker, without lowering blood pressure at all, which makes it an elegant fit for POTS physiology. A randomized trial in hyperadrenergic POTS showed it lowered standing heart rate and improved quality of life. One practical wrinkle for 2026, the brand-name version, Corlanor, has been discontinued in the United States. Generic ivabradine has FDA approval, so the drug remains prescribable, but availability can vary from pharmacy to pharmacy and insurance plan to insurance plan.

Pyridostigmine boosts the parasympathetic side of the autonomic system, the rest-and-digest brake, at doses of 30 to 60 milligrams up to three times daily. It doesn’t raise blood pressure, which is useful in patients who can’t tolerate vasoconstrictors. Stomach cramping and diarrhea are its main limits, and they’re the reason it ends up a supporting player more often than a lead.

Clonidine and methyldopa dial down central sympathetic outflow, which can help the most hyperadrenergic patients, the ones with surging, adrenaline-soaked standing spells. Sedation and mental fog are the trade, and in a syndrome where brain fog is already a chief complaint, that trade is often bad. I reserve these for carefully selected patients.

Intravenous saline deserves a clear-eyed word, since it’s beloved in online POTS communities. For an acute crash, a bad flare, an illness with poor intake, a liter or two of IV fluid can rescue a rough stretch, and I use it that way. As a chronic strategy, with standing infusion appointments or an implanted port, the guidelines land against it, and so do I. Indwelling lines in young patients carry real risks of bloodstream infection and clot, for a syndrome that is not life-threatening. The short-term fix isn’t worth the long-term hazard.

Treatments I Steer Patients Away From

A few interventions circulate in POTS circles with more enthusiasm than evidence, and some carry outright harm. Ablating or modifying the sinus node to slow the racing heart makes mechanical sense and clinical nonsense. The tachycardia in POTS is compensation, and destroying the compensator has left patients worse off. Surgery to decompress a Chiari malformation and stenting of the jugular veins have both been promoted for POTS without evidence to support them, and the professional society guidance recommends against both for routine POTS. And the norepinephrine reuptake inhibitors I mentioned earlier belong on the do-not-start list for most POTS patients, since they push the standing heart rate the wrong direction.

If someone offers you a procedure for POTS, especially one requiring travel and cash payment, that is the moment for a second opinion from an autonomic specialist or a cardiologist who sees this syndrome regularly.

What Recovery Actually Looks Like

Patients ask me whether POTS ever goes away, and the answer has real hope in it. Roughly half of patients improve substantially within one to three years, often to the point that daily life feels normal again. A smaller group, usually the most severely affected, fights the syndrome for longer, and for them the goal shifts to maximizing function, sometimes with the help of a dedicated autonomic center.

Progress in POTS is measured in months and in function, not in days and heart rates. Can you stand through a shower now. Can you get through a shift, a semester, a grocery run at the Encinitas farmers market on a warm Saturday without scouting every place to sit. Those are the wins that count, and they accumulate slowly, then all at once.

When to Get Checked

Book a visit, with your primary doctor or directly with a cardiologist, if your heart races every time you stand and it has gone on for months, especially with lightheadedness, brain fog, or fatigue that improves lying down. Bring your smartwatch data if you have it. A recorded pattern of position-dependent heart rate jumps shortens the road to diagnosis considerably.

Seek care urgently for the things that are never POTS until proven otherwise. Passing out with injury, passing out during exertion, chest pain, new shortness of breath at rest, or a racing heart that is irregular. Those symptoms earn a prompt evaluation, whatever the eventual diagnosis turns out to be.

Common Patient Questions

Is POTS dangerous?

No. POTS can be disabling, and it is not life-threatening. It doesn’t damage the heart muscle, and the racing heart is a structurally normal heart responding to abnormal autonomic signals. I still take the symptoms seriously, because quality of life with untreated POTS can be poor, but the fear that your heart is being harmed can come off the table.

Is POTS just anxiety?

No, and this question carries years of frustration for most of my POTS patients. The overlap is real, a surging heart rate and adrenaline release feel like panic, and hyperadrenergic POTS in particular gets mislabeled constantly. You can see the difference in the vitals. Anxiety doesn’t produce a sustained 30-beat heart rate jump tied to standing that resolves lying down. That pattern is autonomic, and it’s measurable. Plenty of POTS patients also carry entirely understandable anxiety about a body that has stopped behaving. Treating the POTS usually helps both.

Why would a cardiologist tell me to eat more salt?

POTS flips the usual advice. In most of cardiology we restrict salt to lower blood pressure and reduce fluid buildup. In POTS, many patients run a low blood volume, and salt plus fluid expands that volume, blunts the blood pooling, and slows the standing heart rate. The 10 to 12 grams a day I suggest only applies to POTS patients without high blood pressure, kidney disease, or heart failure, which is why the salt prescription needs a physician behind it.

Do I need a tilt table test to be diagnosed with POTS?

Usually not. A carefully done 10-minute standing test in the office, with heart rate and blood pressure recorded at intervals, makes the diagnosis in most patients. Tilt testing helps when the office test is borderline or normal and the suspicion stays high, and it provides beat-to-beat detail an office test can’t match.

Is POTS related to long COVID?

The two overlap substantially. A subset of people with long COVID meets full criteria for POTS, and viral infection was the classic trigger for POTS long before COVID existed. The diagnostic criteria and the treatment approach are the same whether the trigger was COVID, another infection, surgery, or pregnancy.

What’s the single most effective treatment for POTS?

A structured, progressive exercise program that starts recumbent, paired with fluids, salt, and compression. It carries the strongest guideline recommendation of any POTS treatment, ahead of every medication. The medications help, and I prescribe them often, but they work best as a bridge that makes the reconditioning possible.

Will I need medication forever?

Many patients don’t. The common arc is medication support during the first year or two while volume habits and exercise capacity get built, then a taper as the autonomic system settles. Patients who improve on the foundation measures often find the medications did their job by making the foundation tolerable.

A Final Note From Me

POTS sits in an unlucky gap in medicine. It’s common, it mostly affects young women, its symptoms sound vague on paper, and its defining test requires ten patient minutes that busy clinics rarely spend. So patients bounce between diagnoses of anxiety and deconditioning for years, when a blood pressure cuff, a clock, and someone willing to watch would have named it in one visit.

If the story in this article sounds like yours, ask for the standing test. Ask your doctor to record your heart rate lying down and then each minute for ten minutes on your feet. That single request has ended more diagnostic odysseys in my clinic than any scan I order.

If you’re dealing with symptoms like these, or you’ve been diagnosed with POTS and want a second set of eyes on the plan, our office can help. We see patients across coastal North County and San Diego through San Diego Cardiovascular Associates. To get in touch, visit our practice website.

References

1. Sheldon, Robert S., Blair P. Grubb, Brian Olshansky, et al. “2015 Heart Rhythm Society Expert Consensus Statement on the Diagnosis and Treatment of Postural Tachycardia Syndrome, Inappropriate Sinus Tachycardia, and Vasovagal Syncope.” Heart Rhythm 12, no. 6 (2015): e41-e63.

2. Bryarly, Meredith, Lauren T. Phillips, Qi Fu, et al. “Postural Orthostatic Tachycardia Syndrome: JACC Focus Seminar.” Journal of the American College of Cardiology 73, no. 10 (2019): 1207-1228.

3. Vernino, Steven, Kate M. Bourne, Lauren E. Stiles, et al. “Postural Orthostatic Tachycardia Syndrome (POTS): State of the Science and Clinical Care from a 2019 National Institutes of Health Expert Consensus Meeting - Part 1.” Autonomic Neuroscience 235 (2021): 102828.

4. Fedorowski, Artur. “Postural Orthostatic Tachycardia Syndrome: Clinical Presentation, Aetiology and Management.” Journal of Internal Medicine 285, no. 4 (2019): 352-366.

5. Mar, Philip L., and Satish R. Raj. “Postural Orthostatic Tachycardia Syndrome: Mechanisms and New Therapies.” Annual Review of Medicine 71 (2020): 235-248.

6. Taub, Pam R., Adena Zadourian, Hannah C. Lo, et al. “Randomized Trial of Ivabradine in Patients With Hyperadrenergic Postural Orthostatic Tachycardia Syndrome.” Journal of the American College of Cardiology 77, no. 7 (2021): 861-871.

7. Raj, Satish R., Juan C. Guzman, Paula Harvey, et al. “Canadian Cardiovascular Society Position Statement on Postural Orthostatic Tachycardia Syndrome (POTS) and Related Disorders of Chronic Orthostatic Intolerance.” Canadian Journal of Cardiology 36, no. 3 (2020): 357-372.

8. Mathias, Christopher J., Andrew Owens, Valeria Iodice, et al. “Dysautonomia in the Ehlers-Danlos Syndromes and Hypermobility Spectrum Disorders - With a Focus on the Postural Tachycardia Syndrome.” American Journal of Medical Genetics Part C: Seminars in Medical Genetics 187, no. 4 (2021): 510-519.

9. Cornwell, William K., III, Benjamin D. Levine, Diane Baptiste, et al. “Exercise Intolerance and Response to Training in Patients With Postacute Sequelae of SARS-CoV2 (Long COVID): A Scientific Statement From the American Heart Association.” Circulation 152, no. 5 (2025): e50-e62.

10. Freeman, Roy, Wouter Wieling, Felicia B. Axelrod, et al. “Consensus Statement on the Definition of Orthostatic Hypotension, Neurally Mediated Syncope and the Postural Tachycardia Syndrome.” Clinical Autonomic Research 21, no. 2 (2011): 69-72.

Published on damianrasch.com. The above information was composed by Dr. Damian Rasch, drawing on individual insight and bolstered by digital research and writing assistance. The information is for educational purposes only and does not constitute medical advice.