Salt can help raise low blood pressure, and it’s one of the most common recommendations for people whose readings fall below 90/60 mmHg. Sodium causes your body to retain more fluid, which increases blood volume and pushes pressure upward. But whether adding salt is actually a good idea for you depends on why your blood pressure is low and whether it’s causing symptoms.
How Salt Raises Blood Pressure
Sodium is the primary driver of fluid balance outside your cells. When you consume more sodium, your kidneys hold onto more water to keep concentrations balanced. That extra retained fluid increases the total volume of blood circulating through your vessels, which raises pressure against artery walls.
This process works in both directions. Research from a randomized crossover trial published by the American Heart Association found that switching from a low-sodium diet (500 mg per day) to a high-sodium diet measurably raised blood pressure within just one week. So the effect isn’t something that takes months to kick in. Your body responds to changes in sodium intake relatively quickly.
When Low Blood Pressure Actually Needs Treatment
A blood pressure reading below 90/60 mmHg is generally considered low, but numbers alone don’t tell the whole story. Most doctors only consider low blood pressure a problem when it causes symptoms like dizziness, blurred vision, fatigue, trouble concentrating, nausea, or fainting. Some people naturally run low without any issues, and for them, adding extra salt would be unnecessary.
What matters more than the number on the cuff is how much your pressure drops and how fast. A decline of just 20 mmHg, say from 110 to 90 systolic, can be enough to make you feel lightheaded or faint. This is especially common when standing up quickly (orthostatic hypotension), after eating large meals, or during prolonged standing in hot weather.
How Much Salt Helps
For context, the World Health Organization recommends that healthy adults consume less than 2,000 mg of sodium per day, equivalent to about 5 grams of salt (just under a teaspoon). People with symptomatic low blood pressure are often advised to go above that limit deliberately.
General guidance for people with low blood pressure suggests at least 6 grams of salt per day, though the right amount varies based on your overall health and the severity of your symptoms. For people with specific conditions like postural orthostatic tachycardia syndrome (POTS), doctors often prescribe significantly more: 10 to 12 grams of salt daily paired with 2 to 3 liters of water. That high salt intake is specifically designed to expand blood volume in people whose circulatory systems struggle to maintain adequate pressure when upright.
The water component matters as much as the salt. Sodium retains fluid, but only if there’s enough fluid to retain. Increasing salt without also drinking more water limits how much your blood volume can actually expand.
Practical Ways to Increase Sodium
You don’t need to choke down spoonfuls of table salt. The simplest approach is salting your food more liberally and choosing naturally higher-sodium foods like broth-based soups, pickles, olives, cheese, and cured meats. Salted nuts and pretzels are easy snacks that add sodium throughout the day. Soy sauce, miso, and other fermented condiments pack a significant sodium punch in small amounts.
Salt tablets are another option, particularly for people who need a precise daily intake or find it hard to eat enough salty food. These are available over the counter and are sometimes used to prevent heat cramps from excessive sweating, with a typical dose of one tablet per day. If your doctor has recommended a specific sodium target for a condition like POTS, tablets make it easier to hit that number consistently.
Spreading your salt intake across the day tends to work better than loading it all into one meal. Your kidneys are constantly adjusting how much sodium they excrete, so a steady intake helps maintain a more stable blood volume.
Risks of Going Too High
Salt is not a free pass. Excess sodium increases the risk of heart disease, stroke, and kidney damage over time. For most of the population, the problem is too much sodium, not too little. The CDC notes that most Americans already eat well above recommended limits.
This creates a real tension for people with low blood pressure who also have risk factors for heart or kidney disease. If you have a history of heart failure, chronic kidney disease, or are older with stiffening arteries, pushing sodium intake higher could create new problems while solving an old one. The benefit of raising blood pressure needs to be weighed against the cardiovascular cost of chronic high salt intake.
People who are otherwise young and healthy with symptomatic low blood pressure face fewer trade-offs. For them, moderately increasing salt is generally low-risk and can meaningfully reduce dizziness, fatigue, and fainting episodes. But even in this group, it’s worth monitoring blood pressure periodically to make sure it doesn’t overshoot into a range that creates its own problems.
When Salt Alone Isn’t Enough
Salt and fluids are a first-line strategy, but they don’t work for everyone. If your low blood pressure stems from a medication side effect (common with certain blood pressure drugs, antidepressants, or prostate medications), the fix may be adjusting the dose rather than piling on sodium. Dehydration, blood loss, infections, and hormonal imbalances like adrenal insufficiency all cause low blood pressure through mechanisms that salt alone won’t fully address.
Compression stockings, which prevent blood from pooling in the legs, are another common tool for orthostatic hypotension. Small, frequent meals can help if your blood pressure drops after eating. And physical countermaneuvers like crossing your legs or squeezing your thigh muscles before standing can buy your circulatory system a few extra seconds to adjust.
For persistent or severe symptoms, prescription medications that either constrict blood vessels or help the body retain more sodium are available. But for many people with mild, intermittent low blood pressure, a saltier diet and better hydration are enough to make the dizziness stop.