Review JAMA - Postural Orthostatic Tachycardia Syndrome (POTS) A Review - Chung, Raj, 2026

[Kalliope]

Abstract
Importance Postural orthostatic tachycardia syndrome (POTS) is a chronic autonomic disorder characterized by excessive orthostatic tachycardia and multisystem symptoms that affects an estimated 0.1% to 1% of the US population. POTS can substantially impair daily functioning and quality of life.

Observations Consensus criteria define POTS by chronic symptoms of orthostatic intolerance accompanied by a sustained heart rate increase of at least 30 beats/min (≥40 beats/min in adolescents aged 12-19 years) within 10 minutes of standing or head-up tilt, in the absence of orthostatic hypotension, defined as a decrease in either systolic blood pressure of at least 20 mm Hg or diastolic blood pressure of at least 10 mm Hg with positional change. POTS symptoms may include palpitations, lightheadedness, nausea, vomiting, gastroparesis, anorexia, generalized weakness, and muscle pain, despite absence of structural pathology within cardiovascular, gastrointestinal, and neurological organs. POTS predominantly affects females (approximately 90% of cases), with peak incidence from ages 13 to 29 years. However, the true prevalence remains uncertain partly due to underrecognition and lack of a specific diagnostic code for POTS until 2022.

Common symptoms include lightheadedness, palpitations, fatigue, cognitive dysfunction (“brain fog”), exercise intolerance, nausea, bloating, constipation, diarrhea, and sleep disturbance. In a survey of 4835 patients, approximately 70% reported substantial functional impairment and loss of school or work participation, and median diagnostic delay was 24 months. In 30% to 40% of cases, symptoms began within 3 months after infections, such as SARS-CoV-2, Epstein-Barr virus, and influenza. Initial evaluation should exclude other conditions that cause sinus tachycardia, including thyroid disease, adrenal insufficiency, pheochromocytoma, cardiomyopathy, valvular heart disease, congenital heart disease, chronic lung disease, medication effects (eg, stimulants, norepinephrine reuptake inhibitors, and diuretics), anemia, and dehydration.

First-line treatment includes nonpharmacological strategies to improve cardiac preload, including increased fluid and sodium intake, lower-body compression garments; avoidance of heat exposure, dehydration, and prolonged standing; and structured supervised aerobic training. Pharmacological therapies should be individualized and may include β-blockers, ivabradine, midodrine, fludrocortisone, and pyridostigmine, although evidence supporting many therapeutic interventions is limited by small studies and lack of large, randomized trials.

Conclusions and Relevance POTS is a chronic autonomic disorder associated with functional impairment and reduced quality of life that is diagnosed based on characteristic orthostatic symptoms in the absence of orthostatic hypotension after excluding alternative causes of sinus tachycardia. Treatment involves nonpharmacological measures (such as increased fluid and sodium intake), lower-body compression garments, structured exercise training, and individualized pharmacological therapy.

https://jamanetwork.com/journals/jama/article-abstract/2853253

 

[Kalliope]

Podcast An Overview of Postural Orthostatic Tachycardia Syndrome (POTS)

Description:
POTS is a chronic autonomic disorder characterized by excessive orthostatic tachycardia and multisystem symptoms that affects an estimated 0.1% to 1% of the US population. Author Satish Raj, MD, MSCI, of University of Calgary Cumming School of Medicine joins JAMA Deputy Editor Kristin Walter, MD, MS, to discuss current evidence about the pathophysiology, diagnosis, and management of POTS.

https://edhub.ama-assn.org/jn-learning/audio-player/19088273

 

[Kalliope]

Podcast An Overview of Postural Orthostatic Tachycardia Syndrome (POTS)

Description:
POTS is a chronic autonomic disorder characterized by excessive orthostatic tachycardia and multisystem symptoms that affects an estimated 0.1% to 1% of the US population. Author Satish Raj, MD, MSCI, of University of Calgary Cumming School of Medicine joins JAMA Deputy Editor Kristin Walter, MD, MS, to discuss current evidence about the pathophysiology, diagnosis, and management of POTS.

https://edhub.ama-assn.org/jn-learning/audio-player/19088273

I'm listening to the podcast now. Lots of useful tips and information. Dr. Raj mentions ME/CFS as a caveat when it comes to exercise as treatment for POTS.

 

[Jonathan Edwards]

Isn't this just the Raj folklore?
How much of what is in the abstract is actually based on evidence?

 

[InitialConditions]

The abstract looks pretty reasonable to me. Good to get a review in a top journal.

 

[Jonathan Edwards]

The abstract looks pretty reasonable to me. Good to get a review in a top journal.

So where on earth does this come from?

POTS symptoms may include palpitations, lightheadedness, nausea, vomiting, gastroparesis, anorexia, generalized weakness, and muscle pain, despite absence of structural pathology within cardiovascular, gastrointestinal, and neurological organs.

Or this:

However, the true prevalence remains uncertain partly due to underrecognition and lack of a specific diagnostic code for POTS until 2022.

Or this:

Common symptoms include lightheadedness, palpitations, fatigue, cognitive dysfunction (“brain fog”), exercise intolerance, nausea, bloating, constipation, diarrhea, and sleep disturbance.

Or this:

First-line treatment includes nonpharmacological strategies to improve cardiac preload, including increased fluid and sodium intake, lower-body compression garments; avoidance of heat exposure, dehydration, and prolonged standing; and structured supervised aerobic training. Pharmacological therapies should be individualized and may include β-blockers, ivabradine, midodrine, fludrocortisone, and pyridostigmine,

Surely, this is all a folklore invented for commercial purposes, not medicine?

It admits that the evidence base is poor.

I have seen the bogus syndrome of hEDS manufactured through biased referral patterns to physicians with no understanding of how to evaluate evidence. Most of my local colleagues refuse to see ME/CFS precisely because of this bogus medicine. This looks exactly the same to me.

Distressing postural tachycardia is clearly a real problem but if you invent a new disease you need to have some epidemiological evidence that it really exists.

 

[InitialConditions]

You think POTS is a bogus syndrome? Why would POTS be a bogus syndrome but ME/CFS not? Or is ME/CFS a bogus syndrome too?

The epidemiological evidence that POTS exists is of the same form as the epidemiological evidence that ME/CFS exists.

 

[Jonathan Edwards]

You think POTS is a bogus syndrome? Why would POTS be a bogus syndrome but ME/CFS not?

Yes, that is the right question.

The answer is that ME/CFS is simply a collection of symptoms that over time have been recognised as occurring together. Even the claim that these were somehow specifically associated with some biological process that would justify the idea of a syndrome was open to question until we had evidence from genetics that it picks out a particular causal pathway (the gene variants being causal and contributing to this).

But the case of POTS and hEDS and MCAS is distinct in that there is a claim that the syndrome somehow hinges on a definable physiologic or genetic abnormality that is known. For hEDS and MCAS ift is fairly obvious that this just is not the case. The situation for POTS is a bit more subtle but it is still unjustified unless some specific link to the other features is established.

The other features listed in the abstract are essentially ME/CFS, although the magic word PEM is omitted. From the ME/CFS standpoint, we have looked at the literature and found that a specific link with POT rather than OI of uncertain origin is very doubtful.

I do not see how POTS can be a 'comorbidity' with ME/CF if it is invoked to explain the same set of symptoms. It makes no sense.

 

[InitialConditions]

The answer is that ME/CFS is simply a collection of symptoms that over time have been recognised as occurring together.

This is exactly what POTS is.

But the case of POTS and hEDS and MCAS is distinct in that there is a claim that the syndrome somehow hinges on a definable physiologic or genetic abnormality that is known.

Let's just focus on POTS. I don't follow this. What is the definable physiologic abnormality in POTS? Are you talking about the tachycardia criteria? If so, I agree that the syndrome should not be centred on this trait. We have had these conversations elsewhere.

The other features listed in the abstract are essentially ME/CFS, although the magic word PEM is omitted. From the ME/CFS standpoint, we have looked at the literature and found that a specific link with POT rather than OI of uncertain origin is very doubtful.

I do not see how POTS can be a 'comorbidity' with ME/CF if it is invoked to explain the same set of symptoms. It makes no sense.

There's clearly a lot of overlap and shared symptoms. But the POTS symptoms cluster around autonomic dysfunction and orthostatic intolerance. The absence of PEM (and the absence of the 'immune' symptoms/manifestations seen in ME/CFS) in POTS is actually an interesting feature and in my view a good reason to distinguish the two groups whilst acknowledging symptom overlap and potentially shared mechanisms.

 

[Yann04]

But the case of POTS and hEDS and MCAS is distinct in that there is a claim that the syndrome somehow hinges on a definable physiologic or genetic abnormality that is known. For hEDS and MCAS ift is fairly obvious that this just is not the case. The situation for POTS is a bit more subtle but it is still unjustified unless some specific link to the other features is established.

I think this makes sense.
Similarly you could say there is no evidence for ME, as in the conception of the ME/CFS symptoms being caused by encephalomyelitis (brain inflammation). But there is decent evidence for a cluster of symptoms usually called ME/CFS without specific mechanistic claims.

If so, I agree that the syndrome should not be centred on this trait. We have had these conversations elsewhere.

Yeah that’s the claim as I understand it. Not that “POTS symptoms” people experience aren’t real, not that there isn’t a cluster of symptoms called POTS, but putting doubt on the idea that the cluster of symptoms necessarily has any relation to tachycardia. So tachycardia is seen as an arbitrary physiological measure used to create a dubious construct, similar to what some argue for hypermobility in hEDS.

 

[Montyjazu]

As someone with POTS following Long Covid and no classic delayed PEM, my natural bias is towards there being slightly different things going on between what is known as POTS and ME/CFS. I also have unusual raised and suppressed cytokines so don’t fit the pattern there either. I know plenty of people including family members who have a more classical PEM-based illness so am familiar with the difference. I just don’t think we know emough yet, there could be overlaps given how common it is to have both. Some of my symptoms feel very related to the orthostatic side (perhaps not the full set cited above), for instance lightheadedness and feeling unwell on standing, breathlessness on exertion, needing to lie down particularly at the end of the day. Others like migraines, insomnia, vision issues, brain fog may be separate or related. I have had lifelong orthostatic issues that worsened following covid. I suspect that is relevant. I have followed this forum long enough to know the skepticism around POTS/MCAS and can understand why, but I think it remains important to recognise that some people with this type of illness have orthostatic issues or significant food/environmental intolerances whilst others do not and that presumably there is a reason for the differences.

 

[duncan]

Definitions in medicine pose a significant problem.

Who decides which definitions are rooted in reality, and which are simply conjured while actually being rooted in politics or something worse?

 

[Utsikt]

I have followed this forum long enough to know the skepticism around POTS/MCAS and can understand why, but I think it remains important to recognise that some people with this type of illness have orthostatic issues or significant food/environmental intolerances whilst others do not and that presumably there is a reason for the differences.

I agree that the distinction is important. I don’t think anyone are questioning if the symptoms are real, but things very quickly turn into interpretations instead of sticking observations. So lots of things people claim are «symptoms» have a lot of inbuilt interpretations.

Observing that you’re not able to be upright for any length of time is fine. Calling that OI is fine, because it literally means an intolerance of being upright. Attributing that to HR increases (POTS), dysautonomia (what does that even mean?), blood volume etc. is an interpretation of causal relationships that requires more evidence.

Food intolerance is fine as a concept, but there are a lot of wrong or unfounded interpretations in that space, and even in the mainstream people get intolerance and allergy mixed up all the time.

Environmental intolerance gets a bit iffy. What even is «environmental»? Sound is a part of my environment and I can’t tolerate it, is that an environmental intolerance? What about light? Smells? Nickel? Often I feel like it becomes a synonym for moulds and «chemicals», which is an area with lots of pseudoscience and myths.

Edit: welcome, btw, pressed post too soon!

 

[Montyjazu]

Thanks and I agree that the implied causation is a problem and why I understand the scientific pushback on the use of terms like pots and mcas. I suspect, at least in my case, that the HR rise is a response to the orthostatic issue not the cause and found no benefit from ivabradine at least at the lower doses i tried. Where i perhaps differ to some opinions here is that i think the varied symptom patterns are interesting and maybe relevant, whether that is called subsets, labels like pots or something else. It is possible there is some more fundamental driving cause in common, but my suspicion is some treatments to ease symptoms may only help some subsets. I have for instance found benefit from magnesium for sleep and b vitamins for balance issues but doubt this would be relevant for the majority.

 

[Formerhuman]

From my previous discussions on the forum with people who do not regard POTS as a syndrome, the main argument has been, “I don’t believe it.” Interestingly, nobody made that argument about ME/CFS before the publication of GWAS findings.

There is a group of patients with OI, palpitations, exercise intolerance, breathlessness, muscle aches and weakness, sleep problems, and other symptoms, but without “classic” PEM. This is based on my observations within my local patient community and on my reading of the POTS subreddit. And yes, no large GWAS of POTS have been carried out yet. However, not a single clinician on the forum has experience working with such patients. Meanwhile, treating off-label treatment options for POTS as a punching bag seems to be a popular activity here.

In my view, POTS is a grey area. I have no evidence to say whether it is a subtype of ME/CFS or a distinct syndrome. However, lack of PEM makes the latter plausible. In my view, understanding haemodynamic alterations is an important direction for research, regardless of whether POTS is a syndrome in its own right or a subtype of ME/CFS. I suspect that, if a project related to, say, blood volume or muscle perfusion during exertion were proposed through the WeAndME project, it would be rejected on the grounds that “I don’t believe it” or “It’s not related.”

 

[SNT Gatchaman]

I could see these conditions being on a spectrum. Traditionally things have been framed along historical specialty lines: you had pain as a majority symptom, you went to a rheumatologist and were diagnosed with "fibromyalgia"; you went to a cardiologist with OI and abnormally elevated heart rate and dx'd with "POTS". Perhaps you could have all those symptoms and meet the classification for ME/CFS via a general practitioner or physician.

Those related diagnoses all seem to want to allow for well-recognised co-occuring symptoms: fibromyalgia with fatigue and cognitive dysfunction ("fibro-fog"); POTS with similar associated symptoms, as above.

The practical ME/CFS definition allows orthostatic intolerance and/or cognitive dysfunction. I and others here meet these criteria without disabling brain fog, even though there might be other severe neurological symptoms at play (eg sensory hypersensitivity).

It seems plausible to me that there can be a full house situation that we call ME/CFS, but maybe you can have other components in relative isolation. This could be eg POTS/OI, possibly quite disabling by itself, even without PEM etc. It could be fibromyalgia without eg OI or PEM. This might all be genetically determined.

Speculatively, if the key hit in the FM GWAS is HTT, but it was a less significant hit in DecodeME, then maybe that could account for these sorts of variation in symptom presentation and diagnostic confusion.

HTT has a role in extracellular matrix to cell signaling transduction. See eg Dysfunction of Primary Cilium in Huntington’s Disease: How Mutant Huntingtin Disrupts This Cellular Signaling Hub (2026)

 

[ScoutB]

There is a group of patients with OI, palpitations, exercise intolerance, breathlessness, muscle aches and weakness, sleep problems, and other symptoms, but without “classic” PEM.

This is an interesting point. I wonder, then, if the modern (more strict) definition of ME/CFS has lead to the rising diagnosis of other labels. Do you have a sense of if the people you're thinking of would fit under Fukuda for instance?

SNT has mostly (thankfully) scooped a long comment I was foggily trying to word about fibro and overlap.

One thing I'll add is that we tend to tie the follow two things together and maybe sometimes it would help to split them:
1. Does it seem likely that the patients being gathered under the label mostly share the same common underlying problem (so that we can do science and figure out the problem).
2. Are the doctors/researchers who defined the label, and claim to be researching it, doing science properly?

Historically, ME/CFS research hasn't been great at #2. And yet we may have managed #1. Many of us on here mostly encounter the other labels through the lens of #2, we read published papers, we see research presentations etc. We see a lot of questionable stuff and not a lot of evidence that the researchers are thinking things through in a way that *would seem* necessary to achieve #1. But I agree with your point:

However, not a single clinician on the forum has experience working with such patients.

...that probably the way to actually get a sense of #1 would be talking to a lot of POTS patients. I wouldn't mind seeing a good GWAS of a POTS cohort. It would be very interesting to compare with DecodeME the way the fibro study has been, because it does kind of cut out a different circle of the Venn diagram.

 

[SugarSquared]

There is a group of patients with OI, palpitations, exercise intolerance, breathlessness, muscle aches and weakness, sleep problems, and other symptoms, but without “classic” PEM.

I think another helpful distinction point between ME/CFS and POTS is if graded exercise therapy works at not only getting you better but also not deteriorating you. It seems to be quite universal that GET worsens people with ME/CFS, but I've read people with POTS share that GET helped them get a handle on their symptoms. That seems to indicate distinct syndromes.

However, this does not account for the amount of people who have developed POTS at a conditioned time of their life. I don't know what we can make of that if not ME/CFS. I worry that a lot of people either don't know about ME/CFS, are too scared of it, or prefer the biological explanation and treatment options of POTS, no matter how flawed they may be. When I see people talking about having hEDS, POTS, and MCAS all together, I especially wonder if they have ME/CFS. Once again though, they're attractive because they have biological explanations and treatment options, while ME/CFS has a shrug and a wave goodbye.

I really like the spectrum idea that you have @ScoutB. I think it could likely be a neurological problem too with some overlap. It also seems to lean towards young women as ME/CFS does. A GWAS would definitely help clarify if that's the case. I just cannot see POTS being just ME/CFS because it seems like there are so many more people with POTS than ME/CFS. Maybe it's an awareness thing, maybe it's treated as a category to lump young women with unknown problems into, but it seems unlikely to me that POTS is either a meaningless grouping of patients or just ME/CFS.

 

[Jonathan Edwards]

Lets just focus on POTS. I don't follow this. What is the definable physiologic abnormality in POTS? Are you talking about the tachycardia criteria? If so, I agree that the syndrome should not be centred on this trait. We have had these conversations elsewhere.

Yes, the tachycardia. The rest is just ME/CFS as far as I can see.

There's clearly a lot of overlap and shared symptoms. But the POTS symptoms cluster around autonomic dysfunction and orthostatic intolerance.

But this is entirely an artefact of the invention of the concept of POTS as far as we know - exactly as it is for hEDS and MCAS. A physician, maybe Raj, or Rowe or Afrin, decides to market a new 'syndrome' and sets up a clinic to which are attracted hundreds of people who fit the syndrome. There is never any epidemiology done to see whether this syndrome hangs together statistically and moreover, once the syndrome name is out there healthprofessionals will suggest to people what symptoms they might have and people eager to have a diagnosis will volunteer them.

I agree that POTS may have some sort of validity but I have worked alongside the physicians who create these memes all my career and seen how it works.

The difference with ME/CFS is that it has not just emerged from this sort of meme-based clinic. You can make that charge against pivate physicians who diagnose "ME" and probably with justification. But ME/CFS arose as a concept because it was realised that not only the ME-doctors but the profession as a whole had identified a pattern of long-term disabling illness, which got called CFS by those who realised that the original idea of ME was a mirage.

 

[Jonathan Edwards]

Where i perhaps differ to some opinions here is that i think the varied symptom patterns are interesting and maybe relevant, whether that is called subsets, labels like pots or something else.

I don't think there is any real disagreement there. The differences are very interesting and may be telling us a lot. But if you assume the existence of diseases that are just referral artefacts then that gets lost. You end up with someone having three syndromes that are all supposed to explain the same symptoms. Which leads to scientific gobbledygook.