Our team sees one problem under most POTS, dysautonomia and ME/CFS symptoms: the brain can't keep its blood flow steady when you stand. Your CO2 level, your posture and your neck all change that flow, and each one can be measured.
Your brain has its own blood flow control system. Learn why that matters for POTS and why normal blood pressure doesn't guarantee normal brain blood flow.
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Cerebral hypoperfusion means too little blood reaching the brain. What hypoperfusion is, symptoms, causes, why normal blood pressure misses it, and tests.
Proof that the brain controls the autonomic system, using eye movements, cerebral blood flow data, and real patient outcomes from targeted brain rehab.
Cerebellar dysfunction causes dysautonomia and POTS. Learn how the cerebellum regulates autonomic reflexes and how eye movement testing reveals it.
Your heart races when you stand because your brain is losing blood flow, a measurable regulation failure, not anxiety. Here's what's actually happening.
Orthostatic cerebral hypoperfusion syndrome (OCHOS) is a measurable drop in brain blood flow on standing. Learn how it differs from standard POTS.
POTS and OCHOS share one core problem: reduced cerebral blood flow. The 30 BPM threshold dividing them is a 40-year-old artifact, not a biological boundary.
Blood pooling is blood collecting in your legs, feet or hands when you stand. What it looks like, why ankles swell, when it's normal, and its POTS causes.
POTS isn't just about heart rate. Learn why it's really a brain coordination problem, and why treating it as a heart condition misses the mechanism.
Low CO2 narrows brain arteries and cuts blood flow. Here are the symptoms, the causes, how it's measured on a tilt test and what the research says about raising it.
Hypocapnia (low CO2) narrows brain arteries. On standing, that's HYCH: POTS symptoms without the heart rate jump. Here's how the clinic tests and treats it.
Our team found no trial of hyperbaric oxygen (HBOT) in POTS. See what HBOT changes in the blood, why blood flow matters, what trials show and the risks.
Tight muscles, posture and the bones of your neck can squeeze the arteries to your brain. What research shows, who gets symptoms, and how our team tests it.
Neck problems can cause brain fog, memory trouble, dizziness and POTS symptoms. See the 7 ways cervical joint errors reach the brain and how they're tested.
Neck stiffness with dysautonomia isn't random. Learn the neurological connection between your neck, vestibular system, and autonomic symptoms.
Ear fullness, popping, or a heartbeat in your ear with POTS? It often traces to how blood drains from your head, not just your eustachian tubes.
No controlled study has tested craniocervical instability as a cause of POTS. See what the imaging and surgery research shows and how our team reads the neck.
What the research shows about thoracic outlet syndrome and dizziness, why no study links TOS to POTS yet, and how our team checks for compression.
What causes brain fog, why it can get worse when you stand or drive, and how to find which link in your brain's supply chain is weak.
POTS brain fog is slowed thinking and poor focus that often worsens on standing. See what studies show about brain blood flow and what our team tests.
POTS fatigue and brain fog aren't laziness. Dr. Keiser explains why reduced cerebral blood flow starves your brain of fuel and what testing can reveal.
Feeling detached from reality with POTS or dysautonomia? Derealization is often a blood-flow and vestibular signal, not just anxiety. What it means.
Why exercise feels so hard with POTS: the symptoms, what research shows about the heart and fitness, what our team finds in the brain, and what helps.
A transcranial Doppler tracks how fast blood moves to your brain as you're tilted upright, and shows whether it drops in POTS and by how much.
For how this plays out in each condition, see the POTS, ME/CFS and long COVID pages.
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