It is 2 AM and your heart is hammering at a rate you can feel in your teeth. You are lying down, which should help, and it is helping a little, but you are nauseated and shaky and you are not sure whether this is the usual terrible or a new terrible. So you lie there and run the math every POTS patient runs: if I go, I may spend six hours in a plastic chair being told my labs are fine. If I stay, and this is the one time it isn't fine, I will never forgive myself.

That gap between is this an emergency and will anyone believe me is where a lot of people with POTS get stuck. This article is about closing it before the night you need it.

Why the ER is a strange place for POTS

Emergency departments are built to find things that kill people quickly: heart attacks, clots, bleeds, infections. They do this well. POTS, by definition, is none of those. It is a disorder of autonomic regulation in which standing upright produces a sustained rise in heart rate, in adults commonly defined as 30 beats per minute or more within ten minutes of standing, without a drop in blood pressure that would qualify as orthostatic hypotension, along with symptoms that ease when you lie down.

So the typical visit goes like this. You arrive with a fast heart rate. They run an ECG, which shows a fast but structurally normal rhythm. They draw bloods. They may check for things that really should be excluded, like a clot or thyroid problems or anemia. Everything comes back unremarkable. Because the test results are "normal," the visit can feel like an accusation, even when nobody says it.

Here is the reframe that matters: normal tests do not mean the visit failed. They mean the dangerous things were ruled out. The problem is that POTS is a diagnosis made standing up, over minutes, and ER care often happens lying down on a stretcher, where your heart rate may look surprisingly calm.

When going in is reasonable

POTS flares are miserable, but they are usually not dangerous on their own. The harder question is when something else is happening. This is general information, not a replacement for the plan your own clinician gives you, but the following are widely accepted reasons to seek emergency care:

  • Chest pain that feels different from your usual, especially pressure, pain spreading to the arm or jaw, or pain with sweating and breathlessness at rest.
  • Fainting with an injury, especially a blow to the head, or fainting while lying down or sitting, which is not the usual orthostatic pattern.
  • Neurological signs: weakness or numbness on one side, a drooping face, trouble speaking, a sudden severe headache unlike any you've had.
  • Not being able to keep fluids down for many hours, or signs of real dehydration, because that is when POTS can spiral.
  • A heart rate that stays very high even lying down and doesn't settle, particularly with shortness of breath.
  • Symptoms that are new in kind, not just worse in degree. A pattern change is information.

Notice what the list is built around: change. You know what your baseline bad looks like. The ER is for the night it stops looking like that.

What actually happens, and why IV fluids come up

Many people with POTS are given intravenous saline in the ER, and it often makes them feel noticeably better, at least for a while. The logic follows the physiology: many people with POTS have a relative shortage of effective circulating volume when upright, and a liter of fluid goes straight into the bloodstream, bypassing a gut that may be slow to absorb. Clinicians use it, and patients commonly describe relief.

It is worth being honest, though: it is a short-term measure, and the research on repeated IV saline for POTS is limited. It is not a long-term strategy, and frequent infusions through a central line carry real risks, such as infection and clots. If you find yourself needing IV fluids often, that is a conversation for your regular specialist, not something to solve at 2 AM.

How to be heard in triage

Triage nurses sort by risk, in seconds. A person with a heart rate of 140 who says "I have POTS" may be heard as either a clear explanation or a red flag for someone who has diagnosed themselves. Your job is to make the explanation checkable and specific.

Lead with measurements, not adjectives. "I feel terrible" is hard to act on. "My heart rate goes from 78 lying down to 138 within five minutes of standing, my blood pressure stays about the same, and it eases when I lie flat" is a pattern a clinician can recognize and test. Ask them to repeat the lying-then-standing measurement. Many EDs can do orthostatic vitals; they just don't think to unless it's requested.

Also name what you're worried about. If your fear is chest pain that is new, say that first. Saying the red-flag symptom aloud, early, keeps it from being filed under "known condition."

The folder that does the talking for you

When you are dizzy and breathless, you are the worst-positioned person to deliver a clear medical history. So don't. Prepare something that can speak for you, and keep it where you'll grab it: a note on your phone and a printout in your bag.

It should include your diagnosis and who made it, with the name and number of the specialist who knows you. Include your current medications and doses, plus anything you react badly to. Add your usual baseline: resting heart rate, typical standing heart rate, typical blood pressure. Add what has helped in past flares, such as IV fluids, and what has not. Finally, name an emergency contact who can answer questions if you can't.

A letter from your specialist is even better. A short paragraph stating that you have POTS, that tachycardia on standing is expected, and what the usual acute management is can change the tone of the whole encounter.

Your next moves

  • Write your "worse than usual" line today. Decide, in advance and in writing, what would make you go in: for example, new-type chest pain, a faint with injury, or an inability to keep fluids down for a set number of hours. Deciding at 2 AM, frightened, is how people either wait too long or go every time.
  • Build a one-page ER sheet. Diagnosis, specialist's name and number, medications with doses, allergies, and your baseline lying and standing heart rates. Save it as a pinned note and print one copy for your bag.
  • Ask your specialist for a short letter stating the diagnosis and what acute care has worked for you. Bring it up at your next appointment so it's ready before you need it.
  • Do one practice stand test now, lying five minutes, then standing ten, and write the numbers on your sheet. Real data from a calm day makes your story far harder to dismiss on a bad one.
  • Pack a small go-bag: phone charger, a water bottle with electrolytes if you use them, any compression you rely on, and your medication list. Waiting rooms are long, and you'll feel worse if you're stripped of the things that help.

The case for keeping a record

The thread running through all of this is that you shouldn't have to win an argument while symptomatic. The ER rewards people who arrive with clear numbers and a clear history, and it quietly penalizes people who arrive with only a feeling, however accurate that feeling is. If you've been tracking your lying and standing heart rate over weeks, you already own the evidence that makes your night credible: a baseline, a pattern, and a record of what changed.

That is the quiet reason we built Stable, a POTS tracker that keeps your readings and symptoms in one place so your history is ready when you are not at your best. If an emergency sheet like the one above sounds useful, you can take a look at https://stable.lumenlabs.works. But the sheet in your phone's notes app will serve you just as well tonight. Make it before the night you need it.