Racing Heart Every Time You Stand: How Doctors Diagnose POTS

Racing Heart Every Time You Stand: How Doctors Diagnose POTS

Many people experience a racing heart when they stand up too quickly. For most, it passes within seconds. But if your heart rate soars every time you stand—and stays elevated—you may be dealing with Postural Orthostatic Tachycardia Syndrome (POTS). Understanding how doctors diagnose POTS can help you get the right care and find relief.

What Is POTS?
POTS is a form of dysautonomia, meaning your autonomic nervous system (which controls heartbeat, blood pressure, digestion and more) isn't working properly. The hallmark of POTS is an excessive increase in heart rate upon standing—often more than 30 beats per minute (bpm) within 10 minutes—and accompanying symptoms that interfere with daily life.

Common POTS Syndrome Symptoms
People with POTS may experience a variety of symptoms when upright, including:

• Lightheadedness or dizziness
• Rapid heartbeat (palpitations)
• Fatigue or "brain fog"
• Headaches
• Tremors or shakiness
• Nausea or gastrointestinal upset
• Exercise intolerance
• Fainting or near-fainting spells

These POTS syndrome symptoms can range from mild to disabling. If they recur every time you stand and aren't explained by dehydration or medications, it's time to talk to a doctor.

When to Seek Medical Advice
It's normal to feel your heart skip or flutter occasionally, but persistent or severe symptoms deserve attention. Seek medical advice if you notice:

• A heart rate jump of more than 30 bpm within 10 minutes of standing
• Symptoms that disrupt work, school or daily activities
• Fainting episodes or near-fainting
• Dizziness so intense you feel unable to stand safely

Before your appointment, try Ubie's free AI-powered symptom checker to help identify your symptoms and prepare informed questions for your doctor.

How Doctors Diagnose POTS

1. Detailed Medical History
   Your physician will ask about:

   • Onset, frequency and duration of symptoms
   • Triggers (e.g., heat, meals, standing)
   • Other medical conditions (autoimmune disorders, diabetes, thyroid issues)
   • Medications, supplements and hydration habits
   • Family history of fainting or autonomic disorders

2. Physical Examination
   The exam focuses on heart rate, blood pressure and signs of dehydration. Your doctor will:

   • Measure pulse and blood pressure lying down, then immediately upon standing, and again after 5 and 10 minutes
   • Check for abnormal reflexes, signs of neuropathy or skin changes
   • Look for clues of other disorders (e.g., thyroid enlargement, anemia)

3. Orthostatic Vital Signs
   This simple in-office test involves:

   • Resting supine (lying down) for 5–10 minutes
   • Recording heart rate and blood pressure
   • Standing and retaking measurements at 1, 5 and 10 minutes
     A sustained heart rate increase of ≥30 bpm (or ≥40 bpm in those under 19) without significant blood pressure drop suggests POTS.

4. Tilt Table Test
   When office measurements are inconclusive, a tilt table test provides a controlled way to provoke orthostatic changes:

   • You lie on a table that tilts upright
   • Continuous heart rate and blood pressure monitoring over 10–45 minutes
   • Assessment of symptoms alongside vital sign shifts
     This test helps confirm POTS and rules out other causes of fainting (vasovagal syncope, orthostatic hypotension).

5. Additional Tests
   To exclude other conditions, your doctor may order:

   • Blood tests (complete blood count, electrolytes, thyroid function)
   • Plasma volume or red blood cell mass studies
   • Autonomic function tests (sweat testing, heart rate variability)
   • Cardiac evaluation (echocardiogram, Holter monitor)

6. Ruling Out Other Causes
   Many disorders mimic POTS syndrome symptoms. A thorough workup helps rule out:

   • Dehydration or blood loss
   • Medications (diuretics, antidepressants, stimulants)
   • Endocrine problems (adrenal insufficiency, hyperthyroidism)
   • Neuropathy or connective tissue diseases
   • Cardiac arrhythmias or structural heart disease

Preparing for Your Appointment

• Keep a symptom diary: Note when your heart races, how you felt, and what you were doing.
• Track vital signs: If you have a home blood pressure cuff with heart rate, record sitting and standing readings.
• List all medications, supplements and recent illnesses.
• Write down questions: Ask about testing, management strategies and follow-up plans.

Treatment Overview
While there's no cure for POTS, most people improve with a combination of:

Lifestyle Changes

• Increase fluid intake (2–3 liters daily)
• Raise salt intake (under doctor guidance)
• Wear compression stockings or abdominal binders
• Gradually build tolerable exercise (recumbent cycling, swimming)

Medications (as needed)

• Beta blockers (to control heart rate)
• Fludrocortisone (to expand blood volume)
• Midodrine (to raise standing blood pressure)
• Ivabradine (to target heart rate)

Behavioral Strategies

• Small, frequent meals
• Avoiding triggers (hot showers, prolonged standing)
• Physical counter‐maneuvers (leg crossing, muscle tensing before standing)

Always discuss risks and benefits with your doctor before starting any medication or regimen.

Speak to a Doctor
If you experience severe chest pain, shortness of breath, unexplained fainting or other alarming symptoms, seek immediate medical attention. For non‐emergent concerns, schedule an appointment with a cardiologist or autonomic specialist familiar with POTS.

Conclusion
A racing heart every time you stand can be more than just "getting older." Recognizing POTS syndrome symptoms and understanding the diagnostic process empowers you to get the right care. If you're concerned, use Ubie's AI symptom checker to get personalized insights about your symptoms and speak to a doctor about your next steps. Proper evaluation, lifestyle adjustments and guided treatment can help you regain stability and improve your quality of life.