Most of what gets written about POTS and sodium assumes the answer is yes and moves straight to how much. That skips a step. The guidance itself does not read as a blanket instruction, and there are people for whom raising sodium is the wrong move or at least a decision that needs a clinician in the room.
This article is the caution side of the conversation. It covers what the published guidance actually says about who it applies to, what to check before you change anything, and the specific questions worth writing down before an appointment.
If you want the background on POTS itself, our page on electrolytes and POTS covers the definition, the subtypes and the symptom picture. POTS is a form of orthostatic intolerance, meaning symptoms that come on with standing.
The guidance is written conditionally, and that is deliberate
Read the source documents rather than the summaries of them and a pattern shows up immediately. Every major statement hedges.
The 2015 Heart Rhythm Society expert consensus statement phrases its salt and water recommendation for POTS as something that "may be considered," and grades it Class IIb with Level of Evidence E, which is the grade used for expert opinion rather than trial evidence. Its body text goes further and narrows the population: it applies the advice to "patients who are known to or are strongly suspected of having hypovolemia," and adds the qualifier "if tolerated." The same document elsewhere says salt and fluid intake should be promoted "unless contraindicated," though that phrase sits in its vasovagal syncope recommendation rather than in the POTS one, so read it as the authors' general posture rather than as a POTS caveat. The hedges in the POTS text itself are not throwaway words. They are the authors saying this is a starting position for a subgroup, subject to your own clinician's judgement.
The Canadian Cardiovascular Society position statement on POTS from 2020 issues its salt and fluid recommendation as a strong recommendation, but attaches low-quality evidence to it. A strong recommendation on low-quality evidence means the panel thought it was worth doing on balance, not that it has been settled by trials.
The National Institute of Neurological Disorders and Stroke gives no number at all. Its entire statement is that "increasing salt intake and staying hydrated can help regulate blood pressure and increase the volume of blood in the body," last reviewed March 13, 2026. No grams, no milligrams, no daily target. If you have seen a specific figure attributed to NINDS, it did not come from that page.
Published figures do exist elsewhere, they vary widely, and some are stated as a mass of salt while others are stated as a mass of sodium, which are not the same measure: salt is roughly 39 to 40 percent sodium by weight, so a given mass of salt contains about 40 percent of that mass as sodium. We keep all of those in one place, with their units and evidence grades intact, in how much sodium doctors recommend for POTS. This article deliberately does not restate them.
One more thing worth knowing before you decide: a 2022 review in Autonomic Neuroscience by Stock and colleagues reported that the long-term evidence behind high salt intake in orthostatic disorders is limited. What the studies did and did not report is covered in what the POTS sodium research actually reported. It is a reasonable thing to raise with your clinician rather than something to be reassured out of.
Situations where this is a clinician decision, not a self-directed one
None of the following means you cannot raise your sodium. It means the decision has a second variable in it that a general article cannot see.
You are on a sodium-restricted diet. If a clinician has restricted your sodium for kidney disease, heart failure, liver disease, high blood pressure or any other reason, do not override that on the strength of a blog post, ours included. The two instructions genuinely conflict, and the person who wrote the restriction knows why it is there. Take the POTS guidance to them and ask how the two fit together.
You have high blood pressure, or blood pressure that runs high at rest. The salt and fluid strategy in the POTS literature is aimed at expanding blood volume. If your resting blood pressure is already elevated, that is a conversation to have before you start, not after.
You have kidney or heart disease. Sodium handling and fluid load are central to both. Ask specifically rather than assuming the POTS guidance was written with your kidneys or your heart in mind. It was not.
You take medications that act on blood pressure or fluid balance. NINDS lists antidepressants, antipsychotics, some medications used to treat high blood pressure and heart conditions, and diuretics among medications that "may cause or worsen symptoms of POTS," and states plainly that "people with POTS should consult a healthcare provider before starting any new medication." Fludrocortisone, midodrine and beta blockers all appear in the POTS treatment literature and all interact with a volume strategy in ways worth asking about.
Your POTS looks hyperadrenergic rather than hypovolemic. Cleveland Clinic's POTS page lists three types, neuropathic, hyperadrenergic and hypovolemic, and frames the fluid and salt increase specifically as something "your healthcare provider may suggest" for the hypovolemic form. The Heart Rhythm Society text narrows the same way, to patients known or strongly suspected to have low blood volume. That does not mean salt is off the table if your presentation is hyperadrenergic. It means the guidance was not written with your subtype as its target, so ask what applies to you. Many people are not told which subtype they fit, and asking directly is a fair question.
You are pregnant. Pregnancy changes blood volume and blood pressure on its own, and conditions like gestational hypertension or preeclampsia make sodium and fluid a decision for the team managing your pregnancy, not a self-directed one. Ask your obstetric provider before increasing salt.
You are managing another condition alongside POTS. Same principle. Ask the person managing it.
You tried it and it made things worse. "If tolerated" is in the source text for a reason. Feeling worse on a higher intake is information, not failure. Report it rather than pushing through.
Questions to take to the appointment
Copy this list, print it, or read it off your phone. Appointments are short and this is the sort of thing that evaporates the moment you sit down.
- Do I have a reason not to increase my sodium, given my blood pressure, kidneys, heart and liver?
- Which POTS subtype do you think I fit, and does the salt and fluid guidance apply to that subtype?
- Am I on any medication that this would interact with, including anything for blood pressure or any diuretic?
- What number are you actually recommending, and is that number grams of salt or milligrams of sodium?
- Should I raise fluid at the same time, and how much?
- Is a 24-hour urinary sodium test worth doing in my case, before or after I change anything?
- What should make me stop or come back sooner? Which specific symptoms are the signal?
- How long before we review this, and what are we measuring to decide whether it helped?
- If I already have a sodium restriction from another clinician, who decides which instruction wins?
- Is there anything other than sodium you would change first?
If it helps to have the underlying sources in front of your clinician rather than a patient article, our POTS reference page for clinicians lists the primary literature, including Garland and Raj 2021, Sheldon 2015 and Raj 2020, with citations.
The lab test worth knowing about
The Canadian Cardiovascular Society position statement includes a practical tip that rarely makes it into consumer articles. If a patient is not responding to treatment, or supplemental salt intake is suspected to be suboptimal, it suggests 24-hour urine sodium excretion may be measured as a surrogate estimate of dietary salt intake, and names a currently recommended target for 24-hour urinary sodium of greater than 170 mmol per day. The same statement uses that same 170 mmol per 24 hours threshold in the other direction, as a marker of the hypovolemic subtype when excretion falls below it.
Two things to hold onto. That is a urinary excretion measure, not an intake instruction, and it is not something to interpret yourself. It is worth asking whether the test is appropriate for you, particularly if you have been increasing your salt for a while and are not sure whether it is landing.
If the answer is no, or not yet
Salt and fluid are one item on a longer list. The published guidance also covers compression garments, graded exercise programs where appropriate, raising the head of the bed, and prescription options. NINDS notes that graded cardiovascular rehabilitation is "not recommended for everyone" because of exercise intolerance, which is another reason the whole list is a clinician conversation rather than a checklist to work through alone.
If your clinician does support raising your sodium and you end up needing paperwork for a purchase, our page on letters of medical necessity explains what that document is and when it comes up.
Nothing here is medical advice, and none of it substitutes for the person who knows your history. Bring the questions. Let them answer.
Sources
- Sheldon RS, Grubb BP 2nd, 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. PMID 25980576.
- Raj SR, Guzman JC, Harvey P, et al. Canadian Cardiovascular Society Position Statement on Postural Orthostatic Tachycardia Syndrome (POTS) and Related Disorders of Chronic Orthostatic Intolerance. Can J Cardiol. 2020;36(3):357-372.
- National Institute of Neurological Disorders and Stroke. Postural Tachycardia Syndrome (POTS). Last reviewed March 13, 2026.
- Stock JM, Chelimsky G, Edwards DG, Farquhar WB. Dietary sodium and health: how much is too much for those with orthostatic disorders? Auton Neurosci. 2022;238:102947. PMID 35131651.
- Cleveland Clinic. Postural Orthostatic Tachycardia Syndrome (POTS). Cleveland Clinic Health Library, last updated June 8, 2026.
