Medically reviewed by Nachiket J. Patel, MD, FACC, FSCAI. Last reviewed July 2026.
Postural orthostatic tachycardia syndrome, or POTS, is a form of orthostatic intolerance. Symptoms worsen while upright and improve, at least partly, when lying down.
The heart rate rises more than expected after standing, but the condition affects much more than the pulse. Fatigue, exercise intolerance, brain fog, nausea, tremulousness, and temperature sensitivity can be disabling.
A careful evaluation is important because dehydration, anemia, thyroid disease, medication effects, prolonged deconditioning, and other conditions can produce a similar pattern.
What symptoms are common in POTS?
Symptoms can vary from day to day. Heat, illness, menstruation, dehydration, prolonged standing, and disrupted sleep commonly make them worse.
- Lightheadedness or near-fainting while upright
- Rapid or pounding heartbeat
- Fatigue and post-exertional worsening
- Brain fog or difficulty concentrating
- Shakiness, sweating, or temperature intolerance
- Nausea, abdominal discomfort, or early fullness
- Headache
- Exercise intolerance
How is POTS diagnosed?
The diagnosis requires both orthostatic symptoms and a sustained, excessive increase in heart rate while upright, without a sufficient blood-pressure drop or another cause that better explains the findings.
In adults, the heart-rate rise is commonly assessed against a 30-beat-per-minute threshold within ten minutes; a higher threshold is used in adolescents. The numbers must be interpreted with symptoms, age, medications, and the testing method.
Orthostatic vital signs, an electrocardiogram, laboratory work, ambulatory monitoring, an echocardiogram, or a tilt-table test may be used selectively.
What else can look like POTS?
Anxiety can amplify symptoms, but a physiologic heart-rate response should not be dismissed as anxiety without proper assessment. At the same time, treating sleep, stress, and mood can be an important part of whole-person care.
- Dehydration or blood loss
- Anemia
- Thyroid disease
- Medication or stimulant effects
- An inappropriate sinus tachycardia pattern
- A primary arrhythmia
- Orthostatic hypotension
- Severe deconditioning
- Acute infection or systemic illness
How is POTS managed?
Treatment usually begins with nonmedication strategies: adequate fluid intake, clinician-guided sodium intake, compression garments, gradual position changes, and a carefully paced reconditioning program that may begin with recumbent exercise.
Extra fluid or salt is not appropriate for everyone, particularly patients with high blood pressure, kidney disease, or heart failure. The plan should be individualized.
Medication may target heart rate, blood-vessel tone, blood volume, or another dominant mechanism. No single medication works for every patient, and treatment often requires measured adjustments over time.
Building a practical recovery plan
The goal is improved function, not simply a lower standing heart rate. A symptom and activity log can show whether treatment is increasing time upright, school or work participation, and exercise tolerance.
Pushing through a severe flare can backfire, but complete inactivity can worsen deconditioning. A structured plan should find the middle ground and adjust as capacity improves.
Frequently asked questions
Do people with POTS always faint?
No. Near-fainting is common, but many patients never fully lose consciousness.
Is a tilt-table test always required?
No. Properly performed standing measurements may establish the pattern in some patients. Tilt testing is useful when more controlled or detailed assessment is needed.
Can POTS improve?
Many patients improve with time and a tailored program, though the course varies. Progress is often gradual rather than linear.
Related heart and vascular information
Schedule an appointment
If you have a stable heart or circulation concern, request an appointment with Flow Heart & Vascular in Mesa, Arizona. Call 911 for emergency symptoms.
This page provides general education and does not replace individualized medical advice.
