Salt helps manage POTS (postural orthostatic tachycardia syndrome) by expanding blood volume, which reduces the rapid heart rate spike that happens when you stand up. It’s one of the first-line, non-drug strategies recommended for the condition, with expert guidelines suggesting 4,000 to 4,800 mg of sodium per day for people with POTS. Here’s how it works, how much you actually need, and what to expect.
Why Low Blood Volume Causes POTS Symptoms
Many people with POTS have lower-than-normal blood volume. When you stand up, gravity pulls blood toward your legs, reducing the amount returning to your heart. Your body detects this drop through pressure sensors called baroreceptors and responds by ramping up your sympathetic nervous system, the “fight or flight” branch, to increase heart rate and maintain blood pressure.
In POTS, the lower starting blood volume exaggerates this chain reaction. There’s less blood returning to the heart to begin with, so the compensatory response overshoots. Your heart rate climbs sharply, stress hormones like norepinephrine flood the bloodstream, and you feel the familiar dizziness, pounding heart, and lightheadedness that define the condition.
How Salt Corrects the Problem
Sodium pulls water into your bloodstream through osmosis. When you consume more salt, your kidneys retain more water rather than excreting it, and your total plasma volume increases. A study published in the Journal of the American College of Cardiology confirmed that a high-sodium diet in POTS patients eliminated the plasma volume deficit seen on a low-sodium diet.
With more blood circulating, the drop in blood returning to your heart when you stand becomes less dramatic. Your baroreceptors don’t sense as large a deficit, so they don’t trigger as aggressive a response. The result: lower standing heart rate, a smaller heart rate jump from sitting to standing, and reduced levels of norepinephrine. That same study found that the high-salt diet not only corrected blood volume but also brought resting norepinephrine levels back to values seen in healthy controls. The improvement was real, though not a complete normalization of symptoms.
How Much Sodium Is Recommended
The numbers for POTS are significantly higher than general dietary guidelines, which cap sodium at about 2,300 mg per day for the average person. A Heart Rhythm Society Expert Consensus Statement recommended 4,000 to 4,800 mg of sodium per day for POTS patients, which translates to roughly 10,000 to 12,000 mg of table salt (since salt is only about 40% sodium by weight). The Canadian Cardiovascular Society recommends 4,000 mg of sodium per day.
For context, the typical American diet contains about 3,400 mg of sodium. So reaching the POTS target usually requires deliberate effort beyond just eating salty foods. Some health organizations suggest that patients whose sodium excretion falls below about 3,900 mg per day should supplement with 1,000 to 2,000 mg of sodium three times daily on top of dietary intake.
Pairing Salt With Enough Fluid
Salt without adequate water won’t expand your blood volume effectively. The general recommendation is 2 to 3 liters of fluid per day. One protocol that combined increased salt intake (6 to 8 grams per day) with 3 to 4 liters of fluid daily, alongside exercise training and sleeping with the head of the bed elevated, showed improvements in POTS symptoms.
There’s a balance to strike here. Drinking excessive amounts of water without enough sodium can actually dilute your electrolytes and potentially affect heart rhythm. The goal is to increase salt and water together so your body retains the extra fluid rather than just flushing it through your kidneys.
Ways to Get Enough Sodium
There’s no single best method. Some people salt their food heavily, others use salt tablets, and many rely on electrolyte drinks or oral rehydration solutions. Salt tablets offer a convenient, measurable dose but can cause stomach upset if taken without food or water. Spreading your sodium intake across the day, rather than loading it all at once, tends to be easier on your digestive system and helps maintain steadier blood volume.
Salty foods like broth, pickles, olives, and pretzels contribute, but it’s hard to hit 4,000+ mg consistently from food alone without tracking. Many POTS patients find that a combination of naturally salty foods, added table salt, and a supplement or electrolyte mix is the most practical approach.
What Improvement Looks Like
Salt loading improves POTS symptoms but typically doesn’t eliminate them entirely. The research consistently shows reduced standing heart rate, a smaller heart rate jump on standing, and lower stress hormone levels. In one study, patients on a high-sodium diet saw their plasma volume deficit fully corrected compared to a low-sodium phase. But heart rate responses, while improved, didn’t completely normalize to healthy control levels.
The timeline for noticing changes isn’t precisely established in large trials, though one study on patients with posturally related fainting found that two months of sodium supplementation (about 2,400 mg per day on top of baseline diet) improved orthostatic tolerance and blood flow regulation to the brain. Many clinicians treat salt and fluid loading as a foundational strategy that works alongside other interventions like compression garments, exercise, and sometimes medication.
Who Should Be Cautious
High-sodium diets are specifically prescribed for people diagnosed with POTS and similar orthostatic disorders. If you have high blood pressure, heart failure, or kidney disease, the same level of sodium intake could be harmful. The recommendation to consume 4,000+ mg of sodium per day essentially flips standard cardiac advice on its head, which is why it’s tailored to a population with a specific blood volume problem. If you suspect you have POTS but haven’t been formally evaluated, getting a diagnosis first matters, since the symptoms overlap with other conditions where extra salt could do more harm than good.