POTS vs Anxiety: How to Tell the Difference

"Your heart rate is high because you're anxious."

If you have POTS, there's a good chance you heard that sentence — possibly for years — before anyone measured your heart rate lying down and then standing up. It's the single most common wrong turn on the road to a dysautonomia diagnosis, and it happens for a reason that isn't anyone's fault: the two genuinely do share a symptom list.

Racing heart. Shortness of breath. Trembling hands. Dizziness. Nausea. Chest tightness. On paper, they look almost identical.

They are not the same thing, and the difference is more knowable than most people realise.

🧠 First, the thing that has to be said out loud

Anxiety is a real condition. It is not a polite word for "imaginary", and this article is not an argument that anxiety is the lesser explanation. Plenty of people have anxiety, and they deserve treatment for it.

The problem isn't that anxiety gets diagnosed. It's that it gets diagnosed instead of looking further — and once it's in your notes, it has a way of explaining every symptom you present with afterwards.

It's also entirely possible to have both. Living with an undiagnosed, unpredictable physical condition for years is an excellent way to develop genuine anxiety. One does not rule out the other, and a POTS diagnosis doesn't invalidate an anxiety diagnosis — or the reverse.

⚙️ The mechanism is completely different

This is the part that makes everything else make sense.

Anxiety starts with a threat — real, anticipated, or unidentifiable. Your brain signals danger, adrenaline follows, and your body prepares to run. The physical symptoms are downstream of the alarm.

POTS starts with gravity. When you stand, blood pools in your lower body. In most people, blood vessels constrict quickly to push it back up. In POTS, that compensation is impaired — so less blood reaches your heart, and your heart rate climbs sharply to make up the difference. The adrenaline surge is downstream of the circulation problem, not of fear.

Same hormone. Same sensations. Opposite starting point. If you want the fuller picture of what the autonomic nervous system is doing here, our plain-language guide to dysautonomia covers it properly.

🔗 Want more like this? Browse all our POTS guides →

🔍 Five questions that separate them

1. What were you doing when it started?

POTS symptoms are tied to posture. Standing up, standing still, getting out of bed, standing in a queue, a hot shower. Anxiety symptoms are tied to context — a situation, a thought, a place, sometimes nothing identifiable, but rarely the specific act of becoming upright.

If your symptoms have a physical trigger you could put on a timetable, that's information.

2. Does lying down fix it?

This is the closest thing to a home test. In POTS, lying flat removes the gravitational problem, and symptoms typically ease within minutes. Anxiety doesn't particularly care what position you're in — lying down may help you calm, but it doesn't reliably switch the physical symptoms off the way it does with orthostatic intolerance.

3. Which came first — the feeling or the body?

People with anxiety often describe dread arriving first, with the physical symptoms following. People with POTS frequently describe the opposite: the heart races, and then the alarm sets in — because a body doing something frightening is, reasonably, frightening.

That order matters, and almost nobody thinks to mention it.

4. Does it happen when you're calm?

Standing up feeling completely relaxed and still watching your heart rate climb thirty beats is not an anxiety pattern. Anxiety is bad at ambushing you in the middle of a genuinely peaceful moment with no cognitive component at all.

5. Do the classic anti-anxiety strategies work?

Breathing exercises, grounding techniques and therapy help anxiety. They can help anyone feel calmer, so a small benefit doesn't rule POTS in or out — but if you've done the work properly, for months, and standing up still does what standing up does, that's a meaningful data point rather than a personal failure.

📈 The measurement that ends the debate

Here is why this argument is more winnable than most: POTS is defined by a number.

The diagnostic criterion is a sustained heart rate increase of at least 30 beats per minute within ten minutes of standing (at least 40 bpm in adolescents), without a significant drop in blood pressure, in the presence of chronic orthostatic symptoms and after other causes have been excluded.

Anxiety has no such threshold. It cannot be measured by a heart rate monitor and a change of position.

So the conversation stops being "I don't think this is anxiety" — a subjective claim a busy clinician can wave away — and becomes "here are ten mornings of lying and standing heart rates." That's not an opinion. Our guide to what to actually track with POTS covers how to record it usefully, and the diagnostic tests guide explains what a formal active stand or tilt-table test involves.

🩺 How to raise it without being written off

The framing matters more than it should. A few things that tend to land better:

• Lead with the data, not the theory. "My heart rate goes from 72 lying to 118 standing, consistently" is harder to dismiss than "I think I have POTS."

• Name the posture link explicitly. "It happens when I stand, and it stops when I lie down" is the sentence that most often makes a clinician look up.

• Don't reject the anxiety question — answer it. "I've done CBT and I take it seriously. This is separate, and here's why" is far more persuasive than refusing the premise.

• Ask for a specific thing. An active stand test is inexpensive and can often be done in the room. Asking for that is more actionable than asking to be believed.

If you've already been dismissed more than once, our guide to what to say when a doctor doesn't believe you has scripts for exactly this.

❓ Frequently asked questions

📚 Sources & further reading

The information in this article is drawn from the following sources. We encourage you to explore them.

• Dysautonomia International — Postural Orthostatic Tachycardia Syndrome: Diagnostic Criteria

• Standing Up to POTS — Patient Resources and Research Updates

✍️ Written with care by Emma at SpoonieToolkitStudio.