How Blood Volume Affects POTS: The Hidden Role of Hypovolemia


 Exploring the link between low blood volume and postural orthostatic tachycardia syndrome (POTS)

For many people living with POTS (Postural Orthostatic Tachycardia Syndrome), the struggle goes far beyond dizziness and fast heartbeats. One underlying cause that’s often overlooked? Low blood volume, also known as hypovolemia.

Understanding how blood volume impacts the autonomic nervous system may be the key to uncovering why symptoms occur and how to manage them more effectively.

What Is Hypovolemia?

Hypovolemia is a condition characterized by reduced blood plasma volume circulating in the body. It can result from dehydration, blood loss, or abnormalities in blood distribution. In patients with POTS, this reduction often contributes to the body’s inability to maintain normal blood pressure and heart rate during postural changes.

When a person with hypovolemia stands up, their body struggles to push enough blood back to the heart and brain. This results in tachycardia, lightheadedness, and sometimes fainting—classic symptoms of POTS.

How Hypovolemia Impacts POTS Symptoms

In POTS patients, studies suggest that many have lower than normal circulating blood volume, which may contribute to:

  • Increased orthostatic intolerance

  • Compensatory tachycardia (a fast heartbeat meant to keep blood flowing)

  • Chronic fatigue due to poor oxygen delivery

  • Cold hands and feet or sluggish digestion due to poor circulation

While POTS can have multiple root causes—including autonomic nervous system dysfunction and vagus nerve abnormalities—hypovolemia remains a crucial but under-discussed contributor.

Diagnosis and Testing at THBC

At The Heartbeat Clinic (THBC), we use advanced diagnostic tools such as:

  • Tilt Table Testing

  • Autonomic Reflex Screening

  • Volume status assessment and cardiovascular response analysis

These tools allow us to determine if hypovolemia is playing a role in your POTS symptoms, and to tailor your treatment accordingly.

Managing Blood Volume in POTS (Without Medication)

Always consult your healthcare provider before making any changes to your health regimen.

Although there is no one-size-fits-all solution, management strategies may include:

  • Increasing fluid and salt intake under medical guidance

  • Compression garments to reduce venous pooling in the lower body

  • Gentle recumbent exercises to enhance circulation

  • Structured hydration and nutrition plans provided by specialists

Why Choose The Heartbeat Clinic?

THBC, located in Plano, TX, is a leader in diagnosing and treating autonomic disorders, including POTS. Our approach combines:

  • Advanced diagnostics

  • Whole-body symptom mapping

  • Non-invasive treatment plans tailored to each individual

We treat every patient like a partner in care, offering support, guidance, and real answers.

 Call today: 972-739-3290
 Visit us: www.thbc.us

If you've been living with POTS symptoms and haven’t found relief, your blood volume may be part of the missing puzzle. Hypovolemia can have a powerful effect on how your heart and nervous system respond to daily stressors.

At The Heartbeat Clinic, we help patients find clarity—and long-term solutions. Don’t settle for vague answers. Get the full picture today.

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