POTS Syndrome: Why Your Heart Races When You Stand Up, and What Doctors Do About It

Postural orthostatic tachycardia syndrome (POTS), often called POTS postural tachycardia, is a condition where your heart rate spikes abnormally when you move from lying down or sitting to standing. Though it can feel alarming, understanding the "why" and the "what next" can help you take control and work with your healthcare team to manage symptoms effectively.

What Is POTS (Postural Tachycardia)?

POTS is a form of dysautonomia—a disorder of the autonomic nervous system, which controls involuntary functions such as heart rate, blood pressure and digestion. In POTS:

• "Postural" refers to changes in body position (e.g., standing up).
• "Tachycardia" means a rapid heart rate (more than 30 beats per minute increase within 10 minutes of standing in adults).

A sudden heart rate jump of 30+ beats per minute (or over 120 bpm total) without a significant blood pressure drop defines POTS.

Why Your Heart Races When You Stand

When you stand, gravity causes about 500–1,000 mL of blood to pool in your legs and pelvis. Normally, your autonomic nervous system:

1. Narrows (constricts) blood vessels in your legs.
2. Increases heart rate slightly.
3. Sends blood back to the heart to maintain blood pressure and flow to vital organs.

In POTS postural tachycardia, this compensatory mechanism misfires:

• Blood pools excessively in the lower body.
• The nervous system overreacts, causing the heart to race in an attempt to push more blood upward.
• You may feel lightheaded, shaky, or even faint.

Common Symptoms of POTS

While rapid heart rate is the hallmark, POTS can affect many systems. Symptoms often worsen when standing and improve when lying down.

• Heart palpitations or pounding
• Lightheadedness, dizziness or "brain fog"
• Trembling or weakness in legs
• Fatigue or exercise intolerance
• Headaches or migraines
• Nausea or upset stomach
• Anxiety-like feelings (linked to physical discomfort)
• Chest pain or shortness of breath

Possible Causes and Risk Factors

The exact cause of POTS isn't fully understood. It may develop after:

• Viral illness (e.g., COVID-19, mono)
• Surgery or trauma
• Autoimmune conditions (e.g., lupus, Sjögren's)
• Genetic predisposition

Risk factors include:

• Female sex (75–80% of cases)
• Age 15–50 years
• Family history of POTS or related disorders

How Doctors Diagnose POTS Postural Tachycardia

A thorough medical evaluation rules out other causes of rapid heart rate and dizziness:

1. Medical history and symptom review
2. Physical exam
3. Orthostatic vital signs or a tilt-table test:
   • Measurement of heart rate and blood pressure from lying to standing
4. Blood tests to check for anemia, thyroid issues, dehydration
5. ECG or echocardiogram to assess heart function

Diagnosis is confirmed when heart rate increases by 30+ bpm (or to over 120 bpm) within 10 minutes of standing, without a significant drop in blood pressure.

What Doctors Do About It: Treatment Strategies

There's no one-size-fits-all cure for POTS postural tachycardia, but combination approaches can greatly improve quality of life.

Lifestyle and Self-Care

• Increase fluid intake (2–3 L/day) and add extra salt (under doctor guidance)
• Wear compression stockings or abdominal binders to reduce blood pooling
• Raise the head of your bed by 10–20 degrees to improve morning blood flow
• Practice counter-maneuvers: leg crossing, calf muscle tensing, fist clenching
• Start a gradual, recumbent exercise program (e.g., swimming, recumbent biking)

Medications

Depending on symptom severity, doctors may prescribe:

• Fludrocortisone or midodrine to boost blood volume and vessel tone
• Beta-blockers (low-dose) to modulate heart rate
• Ivabradine to specifically lower heart rate spikes
• Pyridostigmine or selective serotonin reuptake inhibitors (SSRIs) in some cases

All medications carry potential side effects, so a personalized plan and regular follow-up are essential.

Physical Therapy and Rehabilitation

A structured program with a physiotherapist or exercise physiologist can:

• Rebuild muscle strength
• Improve vascular tone
• Increase overall stamina

Addressing Associated Conditions

Because POTS often coexists with other issues, your doctor may evaluate for:

• Ehlers–Danlos syndrome
• Mast cell activation syndrome
• Autoimmune diseases

Living Well with POTS

Adapting to life with POTS involves more than medical treatment. Consider these tips:

• Track symptoms in a journal or app to identify triggers
• Pace activities and schedule rest breaks
• Join support groups—online or local—for shared experiences
• Educate close friends, family and employers about your needs
• Explore stress-reduction techniques: gentle yoga, meditation, breathing exercises

If you experience sudden fainting spells triggered by standing, stress, or seeing blood, your symptoms may overlap with Vasovagal Reflex—take a free symptom assessment to better understand what might be happening and share the results with your doctor.

When to Seek Immediate Help

While POTS itself is rarely life-threatening, some signs require urgent medical attention:

• Severe chest pain or pressure
• Sudden fainting for the first time
• Shortness of breath at rest
• Neurological changes (e.g., weakness on one side, slurred speech)

Always talk to your doctor or go to the emergency department if you experience these symptoms.

Talking to Your Doctor

If you're experiencing rapid heart rate upon standing, dizziness or related symptoms:

• Keep a log of when and how often symptoms occur
• Note any triggers, like heat, dehydration or stress
• Share all current medications and supplements
• Ask about tests for POTS postural tachycardia and related conditions
• Discuss a comprehensive treatment plan, including lifestyle changes

Your doctor can tailor evaluation and management to your unique situation.

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POTS postural tachycardia may feel overwhelming, but with proper diagnosis, treatment and self-care, many people see significant improvement. Always speak to a healthcare professional about any concerning or persistent symptoms, especially those that could be life-threatening.