POTS and Dysautonomia: Why Standing Up Is So Hard

Standing up should be unremarkable. For people with POTS, it's the hardest thing they do all day.

What's actually happening

When you stand, gravity pulls roughly half a liter of blood into your legs and abdomen. A healthy autonomic nervous system responds instantly — it tightens blood vessels, nudges heart rate up slightly, and keeps blood moving to your brain.

In POTS, that response is inadequate. Blood pools. The body compensates by driving heart rate up hard. You get the palpitations, lightheadedness, visual greying, brain fog, nausea, tremor, and the exhaustion that follows.

Blood pressure usually stays normal. That's part of why it gets missed — the number that's typically checked looks fine.

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How it's diagnosed

The criteria are specific:

• A sustained heart rate increase of 30 bpm or more within 10 minutes of standing (40 bpm or more if you're 12–19).
• No orthostatic hypotension — blood pressure doesn't drop by 20/10 or more.
• Symptoms for at least three months.
• Other causes ruled out — dehydration, anemia, thyroid disease, adrenal insufficiency, medication effects, prolonged bed rest, and significant deconditioning.

A 10-minute active stand test, done with a proper five-to-ten minute supine rest first, captures most cases. Tilt table testing exists but isn't required for a straightforward presentation.

I'll usually ask you to log standing heart rates over several mornings before we call it anything, because a single reading on a bad day isn't a diagnosis.

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What actually helps

The unglamorous things work best, and they work in a specific order.

Fluid and sodium. Most people need meaningfully more of both than they think — typically in the range of 2–3 liters of fluid daily, with sodium increased under guidance. This is individualized, and it is not appropriate if you have high blood pressure, kidney disease, or heart failure, so it should be set with a clinician.

Compression. Waist-high compression garments in the 20–30 mmHg range outperform knee-highs, because most of the pooling happens in the abdomen, not the calves.

Exercise, but from the ground up. Recumbent bike, rowing, and swimming first. Upright work comes later. Strength work for legs and core is not optional — your leg muscles are part of your circulatory system. Progress is measured in months, and that's normal.

Meals and sleep. Smaller, lower-carbohydrate meals reduce post-meal crashes. Elevating the head of the bed a few inches helps overnight fluid handling.

Trigger management. Heat, alcohol, long showers, and prolonged standing are common aggravators.

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Where medication fits

When the foundation is genuinely in place and you're still limited, there are options — agents that slow heart rate, improve vascular tone, or expand blood volume. Each has trade-offs and each needs monitoring. This is a conversation, not a default.

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What POTS is not

It is not anxiety, though adrenaline surges feel identical to a panic attack and often get labeled as one. It is not laziness. It is not something you can push through with willpower — pushing through is usually what makes the next three days worse.

It also frequently follows a viral illness, surgery, pregnancy, or a period of prolonged bed rest. If your symptoms started after one of those, say so; it's diagnostically useful.

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What I do with it

I confirm the pattern with real data, rule out the conditions that mimic it, and build a plan you can execute on your worst week — not just your best one. Then we adjust it as your capacity changes.

If standing has become the hardest part of your day, that deserves a proper workup.