A POTS diagnosis takes more than a heart-rate number. Postural orthostatic tachycardia syndrome (POTS) is considered when recurring symptoms occur while you are upright and a properly conducted stand or tilt test shows a sustained heart-rate rise. A smartwatch reading can be a useful clue to discuss with a clinician, but it cannot confirm the condition.
Symptoms often include lightheadedness, palpitations, weakness or fatigue when standing, sometimes with improvement when sitting or lying down. People can also experience headaches, digestive symptoms or difficulty concentrating. These symptoms have other possible causes, so the pattern over time matters alongside the test result.
What A Stand Test Measures
During an active stand test, a clinician checks your heart rate and blood pressure while you are lying or sitting and then after you stand. Measurements are taken over time, up to 10 minutes. A tilt-table test assesses a similar response while a table moves you from lying flat toward an upright position, with heart rate and blood pressure monitored.
Current consensus criteria use a heart-rate increase of at least 30 beats per minute (bpm) in adults, or at least 40 bpm in adolescents, within 10 minutes upright. The rise needs to fit with a history of orthostatic intolerance—symptoms brought on by being upright. Clinicians also consider whether blood pressure falls significantly, which may suggest a different or additional problem.
Those thresholds are part of the assessment, not a diagnosis on their own. A 2026 international consensus paper by Kirti Sivakoti, Melissa Cortez, Artur Fedorowski and colleagues set out guidance developed by a multidisciplinary panel of 40 contributors from seven countries. Using a modified Delphi process, the panel reached agreement on 31 statements. The paper is expert guidance, not a clinical trial of a diagnostic test; it also notes that people can have meaningful upright symptoms without meeting the heart-rate threshold for POTS.
Why A Wearable Reading Is Not A POTS Diagnosis
A watch or fitness tracker may capture a pulse increase after you stand. That can help you describe what you have noticed, especially if you keep a record of symptoms and circumstances. But a single reading—or a series of readings collected outside a clinical assessment—does not establish that the increase is sustained, confirm what your blood pressure is doing, or show that other explanations have been considered.
Heart rate can change for reasons other than POTS, and symptoms such as dizziness and a racing heart are not specific to it. Bring your device readings to an appointment if they seem useful, but avoid treating the number as a self-test or changing medication based on it.
What Clinicians Need To Consider
Assessment usually starts with your symptom history, examination and measurements of heart rate and blood pressure with a change in position. Depending on what they find, clinicians may use an electrocardiogram (ECG), blood or urine tests, or further heart and blood-pressure monitoring. A tilt-table test may be considered if the picture remains unclear or specialist assessment is needed.
Low blood pressure and the effects of some medicines can resemble or worsen upright symptoms. Some antidepressants, antipsychotics, medicines for high blood pressure or heart conditions, and diuretics are among the drug groups that may contribute. Do not stop a prescribed medicine on your own; discuss possible effects with the prescriber. If you have persistent symptoms when standing, a clinician can help decide which checks make sense for you.
POTS Treatment Is Usually Tailored
There is no single treatment plan that suits everyone. Care may combine approaches to reduce symptoms and improve day-to-day function. Depending on your health and circumstances, a clinician may discuss:
- Fluids and, for some people, increased salt intake. These changes are not appropriate for everyone, so ask a clinician before making a substantial change.
- Compression clothing, which may help support blood flow while upright.
- Physical activity that builds gradually. Exercise intolerance can make this unsuitable for some people or require adjustment.
- Medication, such as fludrocortisone, midodrine or a beta blocker, depending on symptoms and clinical assessment. The best choice varies, and long-term effectiveness is not equally well established for every medicine.
Finding a workable plan can take time. POTS is also called PoTS in some regions, including the UK; the name differs, but the central issue is a pattern of upright symptoms and heart-rate response. If symptoms are affecting your daily life, bring a clear account of when they occur, what helps, and any relevant readings to a healthcare professional. They can interpret the pattern and assess other possible causes.
