What Is POTS? A Plain-Language Guide to Postural Orthostatic Tachycardia Syndrome
POTS stands for postural orthostatic tachycardia syndrome. In plain terms: when you stand up, your heart rate climbs far more than it should, and you feel unwell because of it.
That is the whole definition. Everything else is detail about why it happens, how it is measured, and what makes it better.
If you have landed here because someone mentioned POTS and you are trying to work out whether it fits, this page is written to be read in one sitting, without medical training.
🌿 THE ONE PAGE THAT GETS IT TAKEN SERIOUSLY
Most first appointments go on whatever you manage to say out loud in ten minutes. Our free POTS Symptoms Checklist puts the whole picture on one sheet: symptoms grouped by area, what makes them better or worse, and the three that matter most with what each one stops you doing.
⚡ Instant download · 🖨️ A4 and US Letter · Undated · No spam, ever 🌿
🫀 What is actually happening
Standing up is a small crisis your body solves several hundred times a day without telling you. Gravity pulls roughly half a litre of blood down into your legs and abdomen the moment you get upright. Less blood returns to your heart, so less goes out to your brain.
In most people the autonomic nervous system fixes this in seconds: blood vessels in the legs tighten, the heart rate rises slightly, and blood pressure holds steady.
In POTS that correction does not work properly. The vessels do not tighten enough, or the blood volume is too low, or the nervous system overshoots. The heart compensates the only way it can, by beating much faster. That racing heart is not the disease. It is your body's emergency response to a problem further upstream.
This matters because it explains why the symptoms are so much wider than a fast pulse: fatigue, brain fog, nausea, breathlessness, shaking, temperature swings. All of it follows from a circulation that does not adjust properly to being upright.
📏 How it is measured
The diagnostic criteria are unusually concrete for a condition this contested.
A sustained heart rate rise of at least 30 bpm within ten minutes of standing, in adults.
At least 40 bpm in adolescents, which is a different threshold and one that gets missed. Our guide to POTS in teens covers why a young person can look borderline against the wrong number.
Without a significant drop in blood pressure. That absence is what separates POTS from orthostatic hypotension, and it is why a doctor checking only blood pressure can miss it entirely.
Symptoms present for at least three months, and worse on standing.
Two details in that first line do a lot of work, and both are easy to get wrong at home.
Sustained means more than one reading. Canadian cardiology guidance asks for the raised heart rate to be seen on at least two measurements a minute apart. A brief spike in the first seconds of standing is common in people who do not have POTS, and it is not what the criterion is describing.
A low resting heart rate changes the sum. If your supine resting rate is under 60, the threshold is calculated from 60 rather than from your actual figure. Someone resting at 55 therefore needs to reach 90 standing, not 85. Guidance also proposes a minimum standing heart rate of 90 bpm in adults, and 100 in teenagers, alongside the rise.
The measurement is usually done with a tilt-table test or an active stand test. Both are described in our guide to the diagnostic tests, which is medically reviewed. Worth knowing before you worry about access to one: guidance says that for most patients a careful history, an examination with orthostatic vital signs and a standard ECG are enough to diagnose and begin treatment, and it advises against routine tilt-table testing.
POTS is also a diagnosis of exclusion. Anaemia, thyroid problems, dehydration and cardiac causes all produce a fast heart rate on standing. Bloodwork is not your doctor doubting you. It is the step that makes the answer trustworthy.
🩺 What it feels like day to day
The symptom that gets named is the racing heart. The symptoms that actually shape someone's life are usually these:
Dizziness and near-fainting on standing, in showers, in queues.
Fatigue that rest does not fix, because staying upright is costing energy all day.
Brain fog, which is a real and documented feature rather than a figure of speech.
Nausea and early fullness, since digestion also depends on blood flow.
Heat intolerance, because warmth dilates the vessels that were already not tightening enough.
Symptoms worse in the morning, which has a specific physiological explanation.
One pattern is worth knowing because it is counter-intuitive: standing still is usually worse than walking. Walking runs the calf muscle pump that returns blood upward. Standing in a queue switches it off.
🔗 Want more like this? Browse all our POTS guides →
😟 Why it gets called anxiety
Because the symptoms overlap almost completely. Racing heart, breathlessness, shakiness, nausea. Anxiety is a legitimate thing to assess, and the two can genuinely coexist.
What separates them is posture. POTS symptoms track standing up and ease on lying down, and they frequently arrive while the person is perfectly calm. Anxiety does not follow gravity. Our guide to POTS versus anxiety goes through this in full.
Being unwell and disbelieved for a year is also a reasonable way to become anxious. Treating that does not mean the POTS was imaginary.
👥 Who gets it
POTS affects an estimated one to three million people in the United States alone, and it is diagnosed most often between the teenage years and the mid-thirties. In adults it is far more common in women, roughly four to one.
It frequently begins after a trigger: a viral infection, surgery, pregnancy, or a period of prolonged bed rest. An identifiable trigger is present in up to half of cases, with infection, surgery and pregnancy the most commonly reported. Post-viral onset has become considerably more visible in recent years.
It also travels with other conditions often enough to have a nickname. POTS, hypermobile Ehlers Danlos syndrome and mast cell activation syndrome co-occur so regularly that the combination is called the trifecta.
🌱 What actually helps
Management is built in layers, and the unglamorous layers do most of the work.
Fluid and salt. Increasing both raises blood volume, which is the variable most directly at fault. Amounts should be set by your doctor, particularly if you have kidney or blood pressure conditions. Our guide to salt and electrolytes covers what to look for on a label.
Compression. Waist-high garments outperform knee-high ones, because most of the pooling happens in the abdomen rather than the calves. Guidance notes that compression below the thighs is unlikely to be effective. How to choose one is its own guide.
Graded, recumbent-first exercise. Rowing, recumbent cycling and swimming build the leg and core muscles that pump blood upward, without the orthostatic cost of upright exercise. This must be progressed slowly and ideally supervised. It is also the measure with the strongest evidence behind it in current guidance, which is worth knowing when it feels like the least appealing item on the list.
Counter-manoeuvres. Crossing your legs, rising onto your toes, leaning on a trolley. Small, invisible, and they work in the moment.
Reviewing what you already take. Guidance puts this first: several medication classes can worsen orthostatic tachycardia, so the opening step is checking whether anything on your current list is contributing.
Medication, where the above is not enough. There are several classes used, and which one suits depends on the picture. That is a conversation with a cardiologist or autonomic specialist rather than something to research alone.
🔭 Does it go away
Sometimes, and more often in younger people. Adolescent-onset POTS is generally regarded as having a better trajectory, with many improving substantially over a period of years.
In adults the more common picture is a condition that becomes manageable rather than one that disappears. That is a real distinction, and it is worth hearing honestly rather than being promised a recovery nobody can guarantee.
💚 If you are at the beginning of this
The average time to a POTS diagnosis is measured in years, not months, and most of that delay is not your fault. What shortens it is arriving with a pattern rather than a description: numbers, dates, and what makes it worse. That is the single most useful thing you can do next.
❓ Frequently asked questions
What does POTS stand for?
Postural orthostatic tachycardia syndrome. Postural and orthostatic both refer to body position, specifically being upright; tachycardia means a fast heart rate; syndrome means a recognised cluster of symptoms rather than a single disease process.
Is POTS a heart condition?
Not primarily. The heart itself is usually structurally normal. The problem sits in the autonomic nervous system and in blood volume regulation, and the fast heart rate is a compensation rather than the fault. This is why cardiac testing often comes back clear.
How is POTS diagnosed?
Through a sustained heart rate rise of at least 30 bpm within ten minutes of standing in adults, or 40 bpm in adolescents, without a significant blood pressure drop, alongside symptoms lasting at least three months. It is measured with a tilt-table or active stand test, and other causes must be excluded first.
My heart rate jumps 40 beats the moment I stand, then settles. Does that count?
Probably not on its own. The criterion asks for a sustained rise, confirmed on at least two readings about a minute apart within the ten minutes upright. A brief spike on first standing happens to plenty of people without POTS. If your resting rate is below 60, the calculation also starts from 60 rather than your actual figure, which changes the number you are aiming at.
Is POTS the same as dysautonomia?
POTS is one form of dysautonomia. Dysautonomia is the umbrella term for any dysfunction of the autonomic nervous system, and it covers a number of distinct conditions of which POTS is the most commonly diagnosed.
Can POTS be cured?
There is no cure, but it is treatable and often substantially improvable. Younger people have the better outlook. In adults the realistic goal is usually good management rather than resolution, achieved through fluid and salt, compression, graded exercise and, where needed, medication.
Why do I feel worse standing still than walking?
Walking activates the calf muscle pump, which pushes blood back up from your legs. Standing still switches that pump off, so blood pools and less returns to your heart. This is why a five-minute queue can be harder than a twenty-minute walk.
🌿 BRING THE PATTERN, NOT THE MEMORY
The single thing that shortens a POTS diagnosis is walking in with it already written down. Symptoms grouped by area, what makes them worse, and the three to raise first. Undated, A4 and US Letter.
Free, always. Unsubscribe in one click 🌿
📚 Sources and further reading
The information in this article is drawn from the following sources. We encourage you to explore them, and to have any suspected POTS assessed by a qualified clinician.
Raj SR, Guzman JC, Harvey P, et al., Canadian Journal of Cardiology 2020: Canadian Cardiovascular Society Position Statement on Postural Orthostatic Tachycardia Syndrome (POTS) (diagnostic criteria in section 3.2, triggers in 6.1, and the treatment summary in section 7)
Dysautonomia International: Postural Orthostatic Tachycardia Syndrome
Cleveland Clinic: Postural Orthostatic Tachycardia Syndrome (POTS)
Johns Hopkins Medicine: Postural Orthostatic Tachycardia Syndrome
Continue reading
⚕️ This article is general information for the chronic illness community and is not medical advice, diagnosis or treatment. Suspected POTS must be assessed by a qualified clinician, who will also rule out other causes. Never start or change fluid, salt, exercise or medication regimes without medical guidance.