Long COVID and POTS: What’s Happening In Your Autonomic Nervous System

You luckily survived the Covid virus, but you have felt different since then. Every time you try to stand up, your heartbeat races while you feel a wave of lightheadedness and a heavy blanket of brain fog like never before. 

To make matters worse, your symptoms seem to be intensifying, yet your routine lab results suggest nothing is wrong.  This dilemma is shared by millions of long-haulers globally and is not a sign of anxiety, deconditioning, or simply “long COVID.” At the heart of these symptoms is a physiological condition, also known as post-COVID POTS. 

This is a well-recognized disorder of the autonomic nervous system that develops in the aftermath of an infection. This disorder is marked by specific diagnostic criteria and treatments that distinguish it from regular POTs. 

Why Does My Heart Race After COVID? 

POTS (Postural Orthostatic Tachycardia Syndrome) is a disorder of the autonomic nervous system. This is the part of your body responsible for regulating the involuntary functions like your heart rate, blood pressure, digestion, temperature, and breathing. 

In the normal state, the autonomic nervous system adjusts your circulation automatically every time you stand up. This ensures blood reaches your brain without making your heart work overtime.

In POTS, that natural adjustment breaks down, causing blood to pool in the lower body regions. The heart compensates by increasing the normal heart rate 30 beats per minute or more within 10 minutes of standing. A series of symptoms follows: dizziness, palpitations, brain fog, fatigue, nausea, and sometimes fainting.

The current medical knowledge suggests that SARS-CoV-2, the virus behind COVID-19, can directly trigger this breakdown in autonomic regulation. 

According to Research published in the American Journal of Medicine, 79% of highly symptomatic long COVID patients met the established diagnostic criteria for POTS. 

The findings of a separate study in Circulation: Arrhythmia and Electrophysiology associated a formal diagnosis of POTS among 31% of all long COVID patients. 

The evidence cannot be reduced to coincidence or an overlap in symptoms between COVID and POTS. Particularly identifiable biological mechanisms link the two. 

Medical illustration mapping blood pooling in the lower body versus normal circulation upon standing, demonstrating the mechanics of post-COVID POTS and autonomic dysfunction. 

How COVID Triggers Autonomic Dysfunction

There is no single pathway by which COVID causes POTS. A complex interplay of pathways appears to be involved, and understanding them matters because different underlying mechanisms may respond better to different treatments.

Autoimmune Damage To Autonomic Nerves

COVID can provoke an immune response that mistakenly targets the body’s own autonomic nerve fibers. Antibodies that the immune system produces to fight the virus may also attack receptors in the autonomic nervous system — disrupting the signals that regulate heart rate and blood pressure. 

This autoimmune pathway is one of the more well-documented mechanisms in post-COVID dysautonomia, and it may explain why some patients continue to deteriorate weeks after the infection itself has resolved.

Small Fiber Neuropathy

Small nerve fibers are delicate nerve endings that carry signals throughout the body, including to blood vessels.  The virus can damage these fibers,  preventing blood vessel walls from receiving the right instructions to contract in the standing position. Consequently, the blood pools downward, and the heart compensates, giving rise to POTS symptoms.

Blood Volume Dysregulation

COVID can alter blood volume and the mechanisms that regulate it. This may include changing the renin-angiotensin-aldosterone system. When the blood volume is lower, it becomes challenging to maintain blood pressure upon standing. This can amplify POST 

Lower circulating blood volume makes the challenge of maintaining blood pressure upon standing even harder, amplifying POTS symptoms.

Vagus Nerve Dysfunction

The vagus nerve is one of the longest nerves in the body, extending from the brainstem through the neck and chest down to the abdomen. 

COVID can infect the vagal nerve, leading to dysautonomia. Vagus nerve dysfunction can hamper the body’s ability to regulate heart rate as well as digestion and the body’s capacity to recover from stress.  

This can contribute to the symptom pattern experienced by many long COVID patients — a system that seems perpetually “on edge.”

The COVID Vaccine and POTS?

One of the most common questions among people with POTs is, “ Can long COVID cause autonomic dysfunction”? 

 Yes, a small number of people have developed POTS-like symptoms following getting a COVID-19 vaccination. This is particularly true of mRNA vaccines. The evidence concerning the relationship between the two is real and documented. 

However, the risk is substantially lower than the risk of developing POTS from a COVID-19 infection itself. 

One research study analyzed data from nearly 300,000 patients to conclude that the risk of developing POST from COVID-19 infection is five times greater than from vaccination. 

If you suspect new or worsening POTS symptoms after vaccination,  it is recommended to go for a clinical evaluation. The vaccination is not to blame for the majority of post-COVID-19 POTS cases, and most autonomic symptoms in people with POTS are temporary. It is possible to return to the baseline state with appropriate POST management strategies. 

How is Post-COVID POTS Diagnosed?

The diagnosis for Post-COVID POTS is similar to that for POTS. The primary method is to measure any change in your heart rate when you move from lying down to standing.

If the heart rate increases to 30 beats per minute or more within 10 minutes of standing, the diagnostic criteria for POST are met. The surge in heart rate mustn’t be accompanied by a significant drop in blood pressure. 

Patients under 19 years of age show a much higher threshold at 40 bpm.

When it comes to how postural orthostatic tachycardia syndrome is diagnosed, several approaches to confirm a POTS diagnosis and understand the specific mechanisms driving your symptoms:

• Active Stand Test (also called the NASA Lean Test or poor man’s tilt): This measures the heart rate and blood pressure in a flat position, then at precise intervals after standing still. 
• Tilt Table Test: A controlled, monitored assessment that can detect  subtler autonomic responses
• Autonomic Nervous System (ANS) Testing: A comprehensive evaluation that assesses multiple autonomic functions to pinpoint the underlying subtype of your POTS. 
• 24-Hour Blood Pressure Monitoring: This helps to keep track of how the cardiovascular system behaves throughout the day, rather than during a visit. 

Tailoring Treatment to Your Specific POTS Subtype

Which treatment will work best for you depends on the specific subtype of POTS you have or the underlying dysfunction in your nervous system. 

For example, in patients with (Hypovolemic POTS), the body lacks enough blood to fight gravity and reach the brain. In this situation, the treatment combines aggressive fluid and salt loading, abdominal compression garments, and medications like fludrocortisone (which forces the kidneys to retain sodium and water) or midodrine (to squeeze loose blood vessels). 

Similarly, if the delicate nerve endings are damaged, full-leg compression stockings can physically force the blood back upward. 

While lifestyle adjustments can provide necessary relief in Autoimmune-Driven POTS, advanced therapies such as immunotherapy (IVIG) or specific anti-inflammatory protocols are administered by an immunologist or specialist. 

Strategies for Managing post-COVID POTS?

There is no single cure or treatment for POTS. However, the condition is manageable by using the right approach and treatment options. 

At Pots.net, we emphasize individualized treatment tailored to your subtype, your symptom severity, and your lifestyle. 

Evidence-supported approaches include:

Increased Salt And Fluid Intake

A basic first step to managing POTS is to increase sodium and fluid intake, provided you don’t suffer from contraindications. These include other health conditions such as high blood pressure, kidney disease, or certain heart conditions, where eating high amounts of salt or retaining fluids can pose a risk to your health.  

Higher sodium expands the blood volume, reducing the degree to which blood pools in the lower body when standing.  Most POTS specialists recommend 2–3 liters of fluid and 3,000–10,000 mg of sodium daily, depending on the patient.

Compression Garments

Compression stockings or abdominal binders apply external pressure to the lower body that counters the downward blood pooling. 

These garments are hardly attractive on the outside and may be uncomfortable too, but highly beneficial for patients who show milder POTS symptoms. 

Graded Exercise

Exercise is one of the most consistently supported long-term interventions for POTS. The heart rate can reach dangerously high levels if you start off with upright exercise straight away. That’s why a phased approach is recommended to use gravity to your advantage. 

For example, horizontal or semi-recumbent exercises like swimming, rowing, and recumbent cycling that keep your body close to the ground help develop inner tolerance against the downward blood flow. 

Once your cardiovascular system is stronger, you gradually transition to semi-upright exercises (like a reconditioned elliptical) and finally fully upright exercises like walking or jogging. 

An exception to the standard training is followed in post-COVID patients with Post-Exertional Malaise (PEM).  In this condition, even minor exertion can aggravate POTS symptoms within 12 to 48 hours of performing it. 

The routine must incorporate floor stretches and breathing exercises to increase flexibility. This is necessary to stay within the recommended energy limits, or otherwise a relapse may occur. 

Targeted Medications

The medication prescribed for POTs depends on its subtype and the symptoms you demonstrate. Commonly used medicines include beta-blockers that help control heart rate and midodrine that raises blood pressure. 

Fludrocortisone is used to increase blood volume, while ivabradine slows the heart rate without affecting blood pressure. 

Immunotherapy may be effective in patients with autoimmune-mediated POTS. This is a subtype of POTS caused by a distorted immune reaction that releases autoantibodies that attack the autonomic nervous system

Never self-medicate for POTS, as proper autonomic testing and clinical evaluation are critical to determine the right medicine mix 

Trigger management

Certain everyday factors can cause sudden, intense POTS flares. Prolonged standing or sitting upright for prolonged periods, and consuming large carbohydrate-heavy meals can all worsen POT symptoms. Other potential triggers include excessive alcohol intake and insufficient fluid levels, which exert significant stress on an unstable autonomic system. 

Understanding and managing triggers is a practical, immediate way to prevent flare-ups, including rapid heart rate, dizziness, and extreme fatigue. This can greatly improve the quality of life for POTS patients and promote better treatment outcomes. 

What to Do If You Suspect Post-COVID POTS 

If you’ve had COVID and now experience any of the POTS symptoms described above, waiting it out can be detrimental to your health. 

These are symptoms of a real, measurable condition that deserves professional attention. This isn’t a psychological aftermath of the deadly pandemic or an inevitable part of getting older.

The single most important decision you can take is to get an accurate diagnosis from a specialist who is familiar with autonomic disorders. General practitioners and even many cardiologists are not always familiar with POTS diagnostic criteria or the nuances of post-COVID autonomic dysfunction. 

At pots.net, we specialize in evaluating and treating complex dysautonomia to help you reclaim your life.  Book your online appointment today. 

FAQS 

Q1: Is post-COVID POTS permanent, or can it be cured?

While POTS is generally classified as a chronic condition with no universal “cure,” it is highly treatable and manageable. Data show that a significant percentage of patients with post-viral POTS experience substantial recovery or a complete return to their baseline health over time as the body clears post-infectious inflammation and nerve fibers heal. Early, individualized clinical intervention combined with targeted lifestyle modifications is the biggest driver of long-term remission.

Q2: Why are my routine blood tests and EKGs coming back completely normal if my heart is racing?

Standard diagnostic testing, such as routine lab work, basic EKGs, and standard echocardiogram, is designed to look for structural heart disease or acute cardiac emergencies (like a heart attack). POTS is caused by a functional misfiring of the autonomic nervous system’s signaling wires, rather than an acute cardiovascular emergency. An advanced autonomic testing, such as a Tilt Table Test or an Active Stand Test, can diagnose the real cause of dysautonomia. 

Q3: What is the connection between post-COVID POTS and chronic fatigue or brain fog?

Brain fog and severe fatigue are direct consequences of orthostatic intolerance. When your autonomic nervous system fails to constrict blood vessels properly upon standing, less oxygenated blood reaches your brain. This mild, transient drop in cerebral perfusion causes immediate cognitive slowing, concentration difficulties, and exhaustion. 

Q4: How does Dr. Suleman differentiate between anxiety and post-COVID POTS?

Anxiety and POTS share overlapping physical traits, such as a rapid heart rate and palpitations, because both involve the sympathetic nervous system. True anxiety causes an elevated heart rate regardless of whether you are lying down, sitting, or standing. However, POTS symptoms are tied directly to postural changes—your heart rate spikes specifically when you stand and drops noticeably when you sit or lie flat.