Does Blood Pressure Drop With POTS? POTS vs. OH Explained

No, in classic Postural Orthostatic Tachycardia Syndrome (POTS), blood pressure does not drop significantly when you stand up ^[1]. The defining characteristic of POTS is an extreme spike in heart rate without a major decrease in blood pressure ^[2][1]. If your blood pressure does drop significantly when you stand, your symptoms are likely caused by a different condition called Orthostatic Hypotension (OH) ^[3].

It is completely normal for patients with POTS to have a naturally low resting blood pressure. However, the diagnostic key is that this baseline blood pressure does not crash further upon standing. Understanding the exact difference between POTS and OH is essential, as they often cause the same symptoms but are diagnosed and treated differently.

POTS vs. Orthostatic Hypotension: The Diagnostic Criteria

When a person stands up, gravity naturally pulls blood downward. In a healthy nervous system, the body immediately adjusts by slightly narrowing blood vessels and slightly increasing the heart rate to keep blood flowing to the brain. In both POTS and OH, this system malfunctions ^[2][3].

In POTS, the blood vessels in the lower body often fail to tighten properly, causing blood to pool in your legs ^[4][5]. To compensate for this pooling and ensure enough blood reaches your brain, your heart beats rapidly ^[6].

However, the diagnostic rules for each condition clearly separate them based on what happens to your vital signs:

• POTS is defined by heart rate: To be diagnosed with POTS, an adult must experience a sustained heart rate increase of at least 30 beats per minute (bpm) within 10 minutes of standing up ^[7][2]. For teenagers (aged 12 to 19), the spike must be at least 40 bpm ^[7]. Crucially, this heart rate spike must occur without a significant drop in blood pressure ^[1].
• Orthostatic Hypotension (OH) is defined by blood pressure: OH is diagnosed when there is a sustained, significant drop in blood pressure, typically within the first 3 minutes of standing ^[3][8]. Specifically, this means a drop of at least 20 millimeters of mercury (mm Hg) in systolic pressure (the top number) or 10 mm Hg in diastolic pressure (the bottom number).

If a patient meets the criteria for a blood pressure drop (OH), any rapid heart rate is typically considered a normal, secondary response to the falling blood pressure, not POTS.

The “Hyperadrenergic” Exception: When Blood Pressure Goes Up

While blood pressure does not drop in POTS, some patients actually experience a rise in blood pressure when standing. This is often seen in a specific subtype called Hyperadrenergic POTS ^[9].

In hyperadrenergic POTS, the body’s sympathetic nervous system (the “fight or flight” system) overreacts to standing by releasing excessive amounts of a stress hormone called norepinephrine ^[9][10]. This surge in adrenaline-like chemicals can cause both a rapid heart rate and an increase in blood pressure, alongside symptoms like tremors, sweating, and anxiety.

Why the Distinction Matters

POTS and OH share many of the same debilitating symptoms, including:

• Dizziness or lightheadedness
• Fatigue and weakness
• Brain fog (trouble concentrating)
• Feeling faint or actually fainting (syncope) ^[11]

Because the symptoms overlap, it is very common for patients to confuse the two conditions or assume POTS simply means “low blood pressure.” Proper testing is necessary to capture exactly what the cardiovascular system is doing. This often involves a Tilt Table Test—a diagnostic test where you lie strapped to a table that is slowly tilted upright while monitors carefully track your heart rate and blood pressure ^[6][12].

Getting the right diagnosis is critical for treatment. Some medications prescribed to lower a racing heart in POTS (such as beta-blockers) could actually worsen symptoms in someone who has Orthostatic Hypotension by lowering their blood pressure even further ^[13].