POTS, Dysautonomia & “Sympathetic Overload”: Why You Feel Wired-Tired (and What Can Help)
If you’ve ever thought, “Why does standing up feel like a workout?”—or you feel racing heart, dizziness, shakiness, brain fog, fatigue, and that wired-but-exhausted feeling—you’re not alone.
A lot of people use the phrase “sympathetic overload” to describe feeling stuck in fight-or-flight. While that phrase isn’t a formal medical diagnosis, it often overlaps with real, recognized conditions such as orthostatic intolerance, POTS, and other forms of dysautonomia.
This post explains what these terms mean, how they relate, what a proper workup looks like, and the strategies that are most often recommended as a starting point.
Educational only: This is not medical advice or a diagnosis. If you suspect POTS/dysautonomia, work with a licensed medical provider for appropriate testing and care.
First: the quick definitions (without the medical jargon)
Dysautonomia (the umbrella term)
Dysautonomia means your autonomic nervous system (the system that automatically regulates heart rate, blood pressure, digestion, temperature, etc.) isn’t regulating normally. It’s an umbrella term that includes many different conditions.
Orthostatic intolerance (the “upright makes me worse” pattern)
Orthostatic intolerance describes symptoms that worsen when you stand and improve when you sit or lie down.
POTS (one common subtype within dysautonomia)
POTS (Postural Orthostatic Tachycardia Syndrome) is typically defined by:
Symptoms that occur with standing (lightheadedness, palpitations, fatigue, etc.)
Heart rate increase ≥30 bpm within 10 minutes of standing (≥40 bpm ages 12–19)
Without a significant blood pressure drop that would explain symptoms
What people mean by “sympathetic overload”
The sympathetic nervous system is your “fight-or-flight” branch. When it’s overactive, you can feel:
Wired/tired
Internal tremor or shakiness
Heart pounding
Sleep disruption
Temperature sensitivity
Anxiety-like sensations (even when you’re mentally calm)
In POTS, one recognized pattern is hyperadrenergic POTS, where there’s evidence of increased sympathetic activation in the upright position. One commonly used research/clinical marker is upright plasma norepinephrine ≥600 pg/mL, but this is something a medical team would evaluate—not an at-home test.
Key point: “Sympathetic overload” describes a feeling/state. POTS is a defined syndrome with specific criteria. You can have sympathetic overactivation without meeting POTS criteria, and you can meet POTS criteria for different reasons (volume issues, pooling, deconditioning, mixed mechanisms).
Common symptoms that cluster together
People with POTS/dysautonomia commonly report:
Lightheadedness, dizziness, “floaty” feelings
Rapid heart rate or palpitations when upright
Brain fog, fatigue, exercise intolerance
Headaches, nausea, GI changes
Heat intolerance, sleep disruption
A helpful clue is the pattern: upright = worse; lying down = better.
A simple home screen (not a diagnosis)
If your clinician agrees it’s appropriate, a basic “stand test” can be informative:
Rest lying down 5–10 minutes, record HR/BP
Stand and record HR/BP at 1, 3, 5, and up to 10 minutes
Note symptoms
Bring those numbers to your provider. Formal diagnosis may involve orthostatic vitals and/or tilt testing and ruling out other causes.
What typically helps (first-line foundations)
Guidelines and reviews commonly emphasize starting with non-pharmacologic strategies and then layering additional interventions as needed.
1) Fluids + electrolytes (personalized)
Many people do better with higher fluid intake and, in some cases, increased sodium—but this must be individualized, especially if you have high blood pressure, kidney issues, or other contraindications.
2) Compression (often more effective than people expect)
Compression garments (often waist-high, sometimes with abdominal compression) can reduce blood pooling and improve upright tolerance for some people.
3) Exercise… but the right kind, in the right order
A common mistake is trying to “push through” upright cardio too early. Many programs start with recumbent/seated training (bike/row/swim) and build gradually.
4) Heat, meals, and pacing
Heat and prolonged standing often worsen symptoms; large meals can also flare symptoms for some people. Learning pacing strategies can reduce crashes.
5) Medications (when appropriate)
Some patients benefit from medications, but those decisions should be made with your medical provider based on subtype and safety considerations.
When to get evaluated urgently
Seek urgent care for chest pain, fainting with injury, severe shortness of breath, sustained irregular rapid heart rhythm, new neurologic symptoms, or severe dehydration/inability to keep fluids down.
Where upper cervical care fits (supportive, not “cure” claims)
POTS/dysautonomia is primarily a medical/autonomic issue. Our role is to support the pieces we can measure and influence—especially when there’s overlap with:
Neck-related dizziness or unsteadiness patterns
Headaches, neck tension, posture and balance issues
Sensorimotor/proprioception deficits
At Upper Cervical Chiropractic Encinitas, we focus on gentle, specific upper cervical care and objective rechecks to help determine whether neck dysfunction may be contributing to your symptom picture—while encouraging appropriate medical evaluation when POTS/dysautonomia is suspected.
Next step (Encinitas / North County San Diego)
If you’re dealing with upright intolerance, dizziness, brain fog, or a wired-tired nervous system pattern, the most productive path is:
Confirm the pattern with proper evaluation (orthostatic vitals/tilt as appropriate)
Start with foundational strategies (fluids/electrolytes, compression, graded exercise, pacing)
Address overlapping contributors (neck, balance, breathing mechanics, sleep, and recovery)
References1) National Institute of Neurological Disorders and Stroke (NINDS). “Postural Tachycardia Syndrome (POTS)”
https://www.ninds.nih.gov/health-information/disorders/postural-tachycardia-syndrome-pots
2) Sheldon RS, et al. “2015 Heart Rhythm Society Expert Consensus Statement…” (PMC full text)
https://pmc.ncbi.nlm.nih.gov/articles/PMC5267948/
3) Raj SR, et al. “Diagnosis and management of postural orthostatic tachycardia syndrome.” CMAJ (2022) (PMC full text)
https://pmc.ncbi.nlm.nih.gov/articles/PMC8920526/
4) Raj SR, et al. Canadian Cardiovascular Society Position Statement on POTS (2020)
https://onlinecjc.ca/article/S0828-282X(19)31550-8/fulltext
5) Cleveland Clinic. “Dysautonomia: What It Is, Symptoms, Types & Treatment” (Updated 2023)
https://my.clevelandclinic.org/health/diseases/6004-dysautonomia
6) Cleveland Clinic. “Orthostatic Intolerance (OI)” (Updated Nov 7, 2025)
https://my.clevelandclinic.org/health/diseases/orthostatic-intolerance
7) Okamoto LE, et al. “Hyperadrenergic Postural Tachycardia Syndrome.” (2024) (PMC full text)
https://pmc.ncbi.nlm.nih.gov/articles/PMC11483201/
8) Raj SR. “Postural Tachycardia Syndrome (POTS).” Circulation (2013) (AHA)
https://www.ahajournals.org/doi/10.1161/circulationaha.112.144501
