POTS, Hydration, Blood Flow, and the Upper Neck

In POTS, feeling steadier usually comes down to two things: how much blood volume you carry, and how freely that blood flows. Water paired with generous salt helps your body hold fluid and fill the tank, while a well-aligned upper neck helps blood and cerebrospinal fluid drain freely from the head. Most people need both.

Why does blood volume matter so much in POTS?

Postural Orthostatic Tachycardia Syndrome (POTS) is, in large part, a problem of circulation under gravity. When you stand, blood pools toward your legs, and a POTS body struggles to push enough of it back up to the brain. Think of watering a garden with a hose: two things decide whether the plants get water — how much is flowing, and whether the hose is kinked. Both matter here. You can learn more about our approach to POTS and the nervous system behind it.

Why isn't drinking water alone enough?

Most people know hydration matters, but the key is fluid *retention*, not just fluid *intake*. If you drink water and your body flushes it straight out, blood volume never actually rises. Pairing water with electrolytes — especially salt — lets your body hold onto that fluid, so your vessels carry the right volume to your brain and body. In a controlled study, a high-sodium diet raised plasma volume and lowered standing heart rate in POTS patients compared with a low-sodium diet (Garland et al., 2021).

How much salt and water do POTS patients need?

For the average adult, roughly 2,300 mg of sodium a day (about one teaspoon of salt) is typical. People with POTS generally need considerably more. Major autonomic centers recommend increasing both salt and fluids: the Vanderbilt Autonomic Dysfunction Center suggests up to about 10 grams of salt and 2–3 liters of water daily to expand blood volume, and the 2015 Heart Rhythm Society expert consensus statement likewise supports increased salt and fluid intake for POTS (Sheldon et al., 2015; Vanderbilt ADC).

The right amount is individual and found through trial and error. A common approach is to start low and increase gradually in small steps, tracking how you feel:

Some people do well with a modest increase.
Others need substantially more to feel steady.
Any change should be guided by your own clinician, especially if you have kidney, heart, or blood pressure concerns.

What does the upper neck have to do with blood flow?

Return to the hose analogy: even with plenty of water turned on, a kink still restricts the flow. Something similar can happen at the craniocervical junction (CCJ) — where the skull meets the top of the spine. This region sits alongside the vessels that carry blood and cerebrospinal fluid (CSF) into and out of the head, so subtle misalignments here may influence jugular or vertebral flow and CSF drainage, which is closely tied to venous outflow.

When blood gets *into* the brain but drains less efficiently *out*, the result can be head pressure, headaches, and dizziness. Restoring alignment at the CCJ is aimed at keeping that outflow clear — the "unkinking the hose" side of the equation, alongside the "filling the tank" side that salt and water address. If dizziness or brain fog are part of your picture, upper neck alignment may be worth evaluating.

Could the upper neck be your missing piece?

Living with POTS can feel like an endless cycle of symptom management. If salt and fluid loading have only gone so far, it may be worth asking whether your upper cervical spine is part of the story. At Cerebral in St. Petersburg, we focus on identifying and correcting misalignments at the craniocervical junction that can interfere with autonomic function, and we pair that with the hydration and lifestyle basics that support blood volume. This complements, rather than replaces, care for related neck pain or dizziness.

Call us at (727) 677-0001 or schedule a consultation online. We take time to understand your history, perform a thorough evaluation, and build a precise, tailored plan.

References

Sheldon RS, Grubb BP, Olshansky B, et al. 2015 Heart Rhythm Society expert consensus statement on the diagnosis and treatment of postural tachycardia syndrome, inappropriate sinus tachycardia, and vasovagal syncope. *Heart Rhythm*. 2015;12(6):e41-e63. https://pubmed.ncbi.nlm.nih.gov/25980576/
Garland EM, Gamboa A, Nwazue VC, et al. Effect of high dietary sodium intake in patients with postural tachycardia syndrome. *Journal of the American College of Cardiology*. 2021;77(17):2174-2184. https://pubmed.ncbi.nlm.nih.gov/33926653/
Vanderbilt Autonomic Dysfunction Center. Lifestyle Measures. Vanderbilt University Medical Center. https://www.vumc.org/autonomic-dysfunction-center/lifestyle-measures

Frequently asked questions

How much salt should someone with POTS eat each day?

It is individualized, but autonomic centers commonly recommend increasing salt well above the general 2,300 mg guideline — the Vanderbilt Autonomic Dysfunction Center suggests up to about 10 grams of salt daily alongside 2–3 liters of fluid. Start gradually and work with your clinician, especially with kidney, heart, or blood pressure concerns.

Why doesn't just drinking more water help my POTS symptoms?

Because hydration depends on retention, not just intake. Plain water is often flushed out before it can raise blood volume. Pairing fluids with salt or electrolytes helps your body hold onto that water, expanding the blood volume that POTS bodies struggle to keep circulating to the brain.

How could my neck affect POTS or dizziness?

The craniocervical junction, where the skull meets the spine, sits next to vessels carrying blood and cerebrospinal fluid to and from the head. Misalignment there may influence how efficiently blood and fluid drain out of the brain, which can contribute to head pressure, headaches, and dizziness in some people.

Can upper cervical care replace salt and fluid loading for POTS?

No. Think of them as two halves of the same picture: salt and fluids fill the tank, while upper cervical alignment aims to keep outflow clear. Hydration and lifestyle measures remain foundational, and upper cervical care is meant to complement them, not substitute for them.