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Standing up should be boring. When it is not, most of what you find online is either a forum thread or a paper you need a subscription to read. These are the plain-language versions: what orthostatic intolerance actually is, how to run a stand test at home without guessing, and how to turn months of bad days into something a cardiologist can read in ninety seconds.
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Why you feel dizzy when you stand up
Roughly half a litre of blood drops toward your legs the moment you get out of a chair, and your body has about ten seconds to deal with it. Here is what that reflex does, what it feels like when it runs late, and the difference between the head-rush everyone gets and the kind worth mentioning to a doctor.
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How to do a stand test at home
The at-home stand test is simple to describe and easy to do badly. A step-by-step you can follow tonight: how long to lie down, what to measure and when, the mistakes that quietly ruin a reading, and when to stop the test.
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How to track symptoms your cardiologist can actually use
Fifteen minutes is not long enough to describe two years of symptoms from memory. What to record, what a useful log looks like on the page, what to leave out, and how to hand it over so it gets read.
Practical guides
The posts above explain how things work. The guides are the do-this-today versions: tracking fluid and salt intake consistently, pacing activity on a bad day, and preparing for a cardiology or autonomic appointment.
About Orsa
Orsa is an iPhone tracker for POTS and dysautonomia. It turns the at-home stand test into a repeatable timed ritual, logs symptoms, fluids and salt, and stacks the results into a chart you can bring to an appointment. See what it does, or read the support pages. The app is not on the App Store yet — you can join the waitlist to hear when it is.
Nothing here is medical advice. Orsa is not a medical device and does not diagnose, treat or rule out any condition. If you faint, have chest pain or feel unwell, seek medical care.