Low systolic blood pressure, generally considered below 90 mmHg, can cause dizziness, fainting, fatigue, and difficulty concentrating. Raising it involves a combination of dietary changes, fluid strategies, physical techniques, and lifestyle adjustments that work together to increase blood volume and prevent blood from pooling in your lower body.
Increase Your Sodium Intake
Sodium pulls water into your bloodstream, which increases blood volume and raises pressure against your artery walls. For people with orthostatic disorders (conditions where blood pressure drops upon standing), medical guidelines recommend significantly more sodium than the general population consumes. The American Society of Hypertension suggests 2,400 to 4,000 mg of sodium per day for these patients, while some specialists recommend up to 4,000 to 8,000 mg daily for more severe cases. For context, the standard dietary guideline for healthy adults is under 2,300 mg.
A practical approach is adding 1,000 to 2,000 mg of sodium to your diet three times per day through salted foods or sodium tablets. In one study of patients who fainted when standing, two months of adding roughly 2,400 mg of daily sodium improved their ability to tolerate upright positions and enhanced blood flow regulation to the brain. Salty broths, pickles, olives, salted nuts, and electrolyte drinks are easy ways to boost intake without relying entirely on supplements.
Drink More Water, Strategically
Water itself has a surprisingly direct effect on blood pressure. A study published in the AHA journal Circulation found that drinking about 480 mL (roughly 16 ounces) of water raised seated systolic blood pressure by 43 mmHg in patients with autonomic failure and by 11 mmHg in older adults without the condition. Even half that amount produced a measurable increase, though the larger volume had a stronger effect.
This means timing your water intake matters. Drinking a full glass of water 15 to 30 minutes before standing up in the morning, before meals, or before any activity that tends to trigger lightheadedness can provide a buffer. Aim for at least 2 to 3 liters of fluid throughout the day, and pair water with sodium so your body actually retains the fluid rather than flushing it through your kidneys.
Use Physical Counter-Pressure Maneuvers
When you feel lightheaded or sense your blood pressure dropping, specific muscle-tensing techniques can push blood back toward your heart and brain within seconds. These are especially useful in situations where you can’t sit or lie down immediately.
- Leg crossing and squeezing: Cross one leg over the other and tighten the muscles in your legs, abdomen, and buttocks. Hold as long as needed or until symptoms fade.
- Arm tensing: Grip one hand with the other and pull them against each other without letting go. This sustained tension redirects blood flow upward.
- Handgrip: Squeeze a rubber ball in your dominant hand for as long as you can or until dizziness passes.
These maneuvers work by compressing the large veins in your limbs and abdomen, forcing pooled blood back into circulation. They’re a first line of defense, not a long-term fix, but they can prevent a faint in the moment.
Wear Compression Garments
Compression stockings and abdominal binders physically prevent blood from settling in your legs and torso when you stand. Most specialists recommend waist-high compression stockings rated at 20 to 30 mmHg or 30 to 40 mmHg of pressure. Knee-high stockings are easier to put on but far less effective, because a large amount of blood pools in the thighs and abdomen, not just the calves.
The higher the pressure rating, the more support you get, but also the harder the garments are to put on. Starting at 20 to 30 mmHg and moving up if symptoms persist is a reasonable approach. Putting them on before getting out of bed in the morning gives you the most benefit, since that’s when blood pressure tends to be lowest.
Adjust Your Meal Size and Timing
After eating, your body diverts a large volume of blood to the intestines for digestion. Normally, your heart rate increases and blood vessels elsewhere tighten to compensate. But if these reflexes are sluggish, blood pressure drops after meals, a condition called postprandial hypotension. This is particularly common in older adults.
Eating smaller, more frequent meals reduces the amount of blood diverted to your gut at any one time. Keeping those meals lower in carbohydrates helps further, since carbohydrates trigger a stronger digestive blood flow response than protein or fat. Drinking extra water with meals also counteracts the drop. If you take blood pressure-lowering medications for another condition, the timing of those doses relative to meals can make postprandial drops worse, so that’s worth discussing with your prescriber.
Elevate the Head of Your Bed
Sleeping with your head slightly elevated, around 10 degrees or roughly 8 to 9 inches higher than your feet, helps your body retain more fluid overnight. When you sleep completely flat, your kidneys sense higher pressure and flush out more sodium and water, which leaves you with lower blood volume by morning. A slight tilt reduces this overnight fluid loss and can make the transition to standing less dramatic.
You can achieve this by placing blocks or risers under the head of the bed frame, or by using a wedge pillow that elevates your entire trunk. Stacking regular pillows under your head alone doesn’t work as well, because it bends your neck without changing the angle of your whole body.
Use Caffeine to Your Advantage
Caffeine constricts blood vessels and can raise systolic blood pressure by 5 to 10 mmHg, particularly if you don’t consume it regularly. The effect kicks in within 30 minutes and can last up to two hours. A cup of coffee before a meal or before a period of prolonged standing can provide a modest but noticeable boost.
If you drink coffee every day, you may develop some tolerance to this effect. Reserving caffeine for times when you need the pressure support most, like mornings or before activities that trigger symptoms, can help maintain its usefulness. Pairing it with water and salt amplifies the benefit.
Putting These Strategies Together
No single approach raises systolic blood pressure as effectively as combining several. A typical daily routine for someone managing chronic low blood pressure might look like this: sleep on an elevated bed, put on compression stockings before standing, drink 16 ounces of water first thing in the morning, eat a small salted breakfast, and use counter-pressure maneuvers if dizziness hits during the day. The sodium, fluid, and compression strategies build your baseline blood volume, while the physical maneuvers and caffeine provide acute boosts when you need them.
If your systolic pressure regularly drops below 90 mmHg or you’re experiencing fainting episodes despite these measures, the underlying cause matters. Conditions like autonomic failure, POTS (postural orthostatic tachycardia syndrome), and medication side effects each respond differently to treatment, and identifying the root issue shapes which combination of strategies will help most.