Long COVID POTS: Symptoms, Assessment and the Genes Involved

What Is Long COVID POTS?

Many people living with Long COVID describe a racing heart when they stand up. Dizziness, fatigue and a foggy head often come with it, and these ease when they lie down again. This pattern is often linked to Long COVID POTS. POTS is short for Postural Orthostatic Tachycardia Syndrome, and here it follows a SARS-CoV-2 infection. POTS is among the most commonly reported conditions in people with Long COVID, and research suggests it has genetic contributors.

POTS sits within a wider group of conditions called dysautonomia. These involve problems with the autonomic nervous system. This is the part of your nervous system that runs things you never consciously think about, such as heart rate, blood pressure, digestion and temperature control.

This article explains how POTS works, what symptoms to look out for, how clinicians assess it, and which genes researchers are studying. It is informational only and is meant to support better conversations with your healthcare professional.

How the Mechanism Works

When you stand up, gravity pulls blood down into your legs and abdomen. In most people, the autonomic nervous system responds within seconds. Blood vessels tighten to push blood back toward the heart and brain. Heart rate rises slightly to keep blood pressure stable.

In POTS, this adjustment does not work smoothly. Blood may pool in the lower body, so less blood returns to the heart. The heart then speeds up considerably to compensate. Several overlapping processes are thought to play a part:

Sympathetic signalling: The sympathetic nervous system uses the chemical messenger norepinephrine to tighten blood vessels and speed up the heart. Changes in how norepinephrine is made, released or recycled can shift this balance.
Receptor function: Norepinephrine acts through adrenergic receptors. If these receptors respond differently, blood vessels and the heart may not react as expected.
Fluid balance: Lower circulating blood volume can make orthostatic symptoms more pronounced.
Autoimmunity: Some research has identified autoantibodies against adrenergic receptors in people with Long COVID. These may interfere with normal signalling.
Gut-brain signals: Emerging work suggests that molecules produced by gut bacteria may also influence autonomic tone.

Different people likely arrive at POTS through different combinations of these pathways. That is one reason genetics is an area of growing interest.

Symptoms and How POTS Is Assessed

Common symptoms

Symptoms of POTS can vary from day to day. They often worsen with heat, prolonged standing, large meals or physical exertion. Commonly reported symptoms include:

A rapid or pounding heartbeat on standing
Light-headedness, dizziness or near-fainting
Fatigue and exercise intolerance
Brain fog and difficulty concentrating
Shakiness, sweating or a feeling of anxiety without a clear trigger
Blurred vision or headaches when upright
Purplish discolouration of the legs after standing for a while
Nausea and other digestive complaints

Many of these overlap with other Long COVID symptoms, which is why a structured assessment is helpful.

The active standing test

Many clinicians use the active standing test as a simple first step. You lie down and rest for a few minutes while your heart rate and blood pressure are recorded. You then stand up, and the measurements are repeated at intervals, usually over about ten minutes. Commonly used criteria in adults look for three things within that window:

A sustained rise in heart rate of around 30 beats per minute
No significant drop in blood pressure
Ongoing symptoms

The tilt table test

For a more controlled assessment, a clinician may arrange a tilt table test. You lie on a table with safety straps, and the table is tilted to a near-upright position. Heart rate, blood pressure and sometimes other signals are monitored continuously. Your leg muscles are not working to push blood back up during the test. Because of this, it can reveal autonomic responses more clearly than standing alone.

Genes and Variants Linked to POTS in Long COVID

The genes below are part of the ChronicDNA autonomic and gut-brain panels. Research into each is still emerging. Carrying a particular variant does not mean you have or will develop POTS. Your genes are one piece of a larger picture.

Adrenergic receptors

ADRB2: This gene encodes the beta-2 adrenergic receptor, which helps relax smooth muscle and influences metabolism. Studies have identified ADRB2 autoantibodies in people with Long COVID. These may contribute to autonomic symptoms such as POTS and exercise intolerance. The variant rs1042713 is one of the markers studied in this gene.
ADRA1A: The alpha-1A adrenergic receptor drives the sympathetic tightening of blood vessels in the limbs. This type of vasoconstriction appears to be impaired in POTS. Research suggests that ADRA1A variants such as rs2322333 may affect vascular responses and blood pressure control on standing.
ADRA2A: This receptor acts as a brake on norepinephrine release and also mediates peripheral vasoconstriction. Variants such as rs1800544 may influence how sympathetic nerve activity is regulated in Long COVID POTS.

Norepinephrine production and recycling

DBH: Dopamine beta-hydroxylase converts dopamine into norepinephrine in sympathetic nerves and the adrenal glands. Studies have explored variants including rs1611115 and rs6271. Researchers are looking at their effect on norepinephrine synthesis, autonomic tone and susceptibility to orthostatic intolerance.
SLC6A2: This gene encodes the norepinephrine transporter, which recycles norepinephrine at sympathetic nerve endings. Dysfunction of this transporter in heart and sympathetic neurons impairs norepinephrine reuptake. A variant known as Ala457Pro has been associated with orthostatic intolerance, a key mechanism in POTS. ChronicDNA also looks at the markers rs2242446 and rs36019.

Fluid balance

AVP: Arginine vasopressin, also called antidiuretic hormone, helps the kidneys hold on to water and modulates the stress response. Dysregulation of vasopressin may contribute to POTS-like symptoms. Variants studied include rs2282018 and rs3759129.

The gut-brain connection

FFAR3: This receptor responds to short-chain fatty acids made by gut bacteria, such as propionate and butyrate. It is found in the sympathetic nervous system, which links gut microbial activity to autonomic regulation. Research suggests that reduced FFAR3 signalling in an imbalanced gut may contribute to sympathetic-parasympathetic imbalance. Markers include rs2074058 and rs35595281.

Practical Implications

Understanding the genetics of POTS will not give you a label or a single answer, but it can add useful context. Here are some ways people use this kind of information:

Framing questions for your clinician. Your results may point to differences in norepinephrine handling or receptor function. If so, you can ask whether those pathways are relevant to your symptoms and assessment.
Making sense of patterns. Understanding the mechanisms can help explain why heat, standing or meals affect some people so strongly.
Tracking your own data. Recording heart rate, blood pressure and symptoms over time gives your care team concrete information to work with.
Avoiding self-directed changes. Genetic information is not a basis for starting or stopping any medication or supplement on your own. Any changes to how you manage POTS belong in a conversation with a healthcare professional who knows your full history.

Genes also interact with infection history, immune responses, fitness, hormones and environment. Two people with the same variant can have very different experiences. To learn more about how these pathways fit together, see our overview of POTS genetics.

Get Personalized DNA Insights

If you have raw data from a consumer DNA test, ChronicDNA can show which of these autonomic and gut-brain variants appear in your results. Your report also explains what current research suggests about each one. It is designed to support informed discussions with your healthcare professional, not to replace them. Get your ChronicDNA report