Hyperadrenergic POTS
When standing triggers an excessive adrenaline-like response.
Hyperadrenergic POTS is a pattern of postural orthostatic tachycardia syndrome in which standing triggers excessive sympathetic nervous system activation. In addition to the rapid heart rate seen with POTS, patients may experience adrenaline-like surges, tremulousness, palpitations, sweating, blood pressure elevation, headaches, internal shakiness, and anxiety-like episodes.
Hyperadrenergic POTS is a form of postural orthostatic tachycardia syndrome in which standing causes an exaggerated sympathetic nervous system response. Patients may experience a rapid heart rate, internal shakiness, tremulousness, sweating, anxiety-like symptoms, blood pressure elevation, headache, and a sense that the body is “stuck in fight-or-flight.”
At NeuroSport Spine and Concussion Center, we evaluate hyperadrenergic features as part of a broader autonomic assessment, because many patients do not fit neatly into one POTS subtype.
What Is Hyperadrenergic POTS?
Hyperadrenergic POTS refers to a pattern of POTS where the sympathetic nervous system becomes overactive during standing. The sympathetic system is the body’s activation system. It helps regulate blood pressure, heart rate, vascular tone, alertness, and stress response.
Hyperadrenergic POTS is a phenotype or pattern that may occur alone but frequently overlaps with other mechanisms of POTS.
Hyperadrenergic POTS does not necessarily mean the body is simply producing “too much adrenaline.”
The physiology is more nuanced. Elevated upright norepinephrine is commonly used as a marker of the hyperadrenergic phenotype, but increased norepinephrine can also occur as a compensatory response to hypovolemia or partial autonomic neuropathy. Recent work continues to emphasize that hyperadrenergic physiology is heterogeneous rather than a single mechanism
In many patients with hyperadrenergic features, standing does not simply cause tachycardia. It may also trigger an adrenaline-like surge.
Common features may include:
Rapid heart rate when upright
Palpitations or pounding heartbeat
Tremulousness or internal vibration
Sweating
Headache or head pressure
Lightheadedness
Nausea
Shortness of breath
Anxiety-like symptoms without a primary anxiety disorder
Elevated or unstable blood pressure when standing
Poor tolerance of heat, stress, exertion, or prolonged upright posture
POTS is generally defined by excessive heart rate increase with standing, typically at least 30 bpm in adults within 10 minutes of standing, without orthostatic hypotension.
Symptoms of Hyperadrenergic POTS
The symptoms can vary across a broad spectrum and include:
Adrenaline-like or adrenergic surges
Rapid heart rate when standing
Pounding heartbeat or palpitations
Internal shaking or visible tremulousness
Sweating
Blood pressure elevation or marked BP variability
Headache or head pressure
Lightheadedness
Shortness of breath
Nausea
Cold or sweaty hands and feet
Heightened sensitivity to heat, exertion or stress
Anxiety-like episodes or a sudden sense of physiologic alarm
Why Hyperadrenergic POTS Can Be Misread as Anxiety
This is where patients often get stuck.
Hyperadrenergic POTS can look like anxiety because the body is producing anxiety-like physiology: rapid heart rate, shakiness, sweating, chest tightness, and a sense of alarm. But the trigger may be orthostatic stress, not a psychological panic disorder.
That distinction matters.
A patient may feel anxious because their body is surging, not surge because they are anxious. Big difference. One is a software problem, the other is the wiring and power supply misbehaving.
Many patients with symptoms such as rapid heart rate, dizziness, and fatigue are told their condition may be related to anxiety.
How Hyperadrenergic POTS Is Identified
Hyperadrenergic POTS is often associated with elevated upright norepinephrine. A commonly used research and clinical threshold is upright plasma norepinephrine of 600 pg/mL or greater, although interpretation must consider testing conditions, medications, hydration, pain, stress, and other clinical factors.
Other findings may include:
Orthostatic tachycardia
Increase in systolic blood pressure when standing
Exaggerated sympathetic symptoms during upright testing
Tremulousness or visible shaking
Symptom reproduction during orthostatic challenge
Coexisting hypovolemia, neuropathic POTS, post-concussion dysautonomia, or deconditioning
Johns Hopkins describes hyperadrenergic POTS as POTS associated with elevated norepinephrine, while also recognizing other overlapping forms such as neuropathic and hypovolemic POTS.
How Hyperadrenergic POTS Differs From Other POTS Patterns
Hyperadrenergic features
Prominent sympathetic activation, adrenergic surges, tremulousness, BP elevation and sometimes elevated upright norepinephrine.
Neuropathic features
Impaired peripheral sympathetic vasoconstriction may contribute to excessive pooling of blood in the lower body. The resulting tachycardia and sympathetic activation can actually produce secondary hyperadrenergic findings.
Hypovolemic features
Reduced circulating volume can cause compensatory sympathetic activation and tachycardia. Importantly, elevated norepinephrine does not automatically establish a primary hyperadrenergic disorder.
Post-concussion or other autonomic dysfunction
Neurologic injury or disruption of autonomic regulation may produce a mixed phenotype involving abnormal heart-rate control, vascular regulation, exercise tolerance and sympathetic activation.
POTS Does Not Always Fit Into One Box
Many patients do not fit neatly into a single POTS subtype. Hyperadrenergic, neuropathic, hypovolemic, and other autonomic features can overlap.
At NeuroSport, we focus on the physiologic pattern driving the symptoms, rather than relying on a subtype label alone.
NeuroSport Evaluation Approach
At NeuroSport, we do not evaluate hyperadrenergic POTS by symptoms alone. Symptoms matter, but objective testing helps clarify the pattern.
Evaluation may include:
Detailed history of orthostatic symptoms
NASA Lean Test or structured orthostatic vitals
Heart rate and blood pressure response to standing
Review of symptom timing and triggers
Assessment for post-concussion autonomic dysfunction
Screening for overlapping POTS patterns
Cold Pressor Test when hyperadrenergic features are suspected
Consideration of laboratory testing when clinically appropriate
Coordination with cardiology, primary care, or other specialists when needed
The goal is not simply to label the subtype. The goal is to understand the patient’s autonomic behavior so care can be better targeted.
Cold Pressor Test
The Cold Pressor Test may be useful when evaluating patients with suspected hyperadrenergic features.
This test challenges the sympathetic nervous system and may help assess whether the patient demonstrates an exaggerated blood pressure or heart rate response to stress. It does not replace a full autonomic evaluation, but it can provide useful clinical information when interpreted in context.
The Cold Pressor Test creates a controlled sympathetic challenge. Blood pressure and heart-rate responses can provide additional information about sympathetic cardiovascular reactivity in patients reporting adrenergic surges, tremulousness, BP spikes or other suspected hyperadrenergic features.
At NeuroSport, this may be considered when patients report:
Adrenaline surges
Tremulousness
Blood pressure spikes
Symptoms that worsen with stress or exertion
Orthostatic tachycardia with sympathetic activation
Post-concussion autonomic instability
It is not a stand-alone diagnostic test for hyperadrenergic POTS and should be interpreted in the context of the patient's orthostatic testing and clinical presentation.
Treatment and Management Principles
Management of hyperadrenergic POTS should be individualized. The wrong intervention at the wrong time can flare the system. Subtlety matters.
Care may include:
Moreau POTS Protocol when clinically indicated
Careful pacing of physical activity
Avoiding rapid overtraining
Trigger identification
Breath regulation and recovery strategies
Medication discussion with the appropriate prescribing clinician when indicated
For many patients, care is not about “pushing harder.” It is about improving autonomic tolerance without repeatedly provoking a flare.
Do Your Symptoms Suggest Hyperadrenergic POTS?
If standing triggers rapid heart rate, adrenaline-like surges, tremulousness, blood pressure elevation, sweating, palpitations or unexplained anxiety-like episodes, a structured autonomic evaluation may help determine what is driving the response.
NeuroSport evaluates POTS and dysautonomia using detailed clinical assessment and objective physiologic testing, with particular attention to overlapping autonomic patterns rather than relying on symptoms alone.Hyperadrenergic POTS is not just “high adrenaline.” It is a pattern of impaired autonomic regulation.
Many patients with this pattern have overlapping contributors, including post-concussion syndrome, cervical dysfunction, poor sleep, connective tissue disorder, hypovolemia, neuropathic features, or reduced physiologic reserve.
That is why NeuroSport evaluates the whole clinical picture, not just the heart rate number.
Concerned About Hyperadrenergic POTS?
If standing causes rapid heart rate, tremulousness, adrenaline surges, blood pressure spikes, or anxiety-like symptoms, a structured autonomic evaluation may help clarify what is happening.