Low blood pressure, generally defined as a reading below 90/60 mmHg, can cause dizziness, fatigue, and fainting. A drop of just 20 points in the top number is enough to make you feel lightheaded. The good news is that several straightforward strategies can bring your numbers up, from dietary changes to physical techniques that work in seconds.
Increase Your Salt and Fluid Intake
Salt is the most reliable dietary tool for raising blood pressure. Sodium pulls water into your bloodstream, which increases blood volume and pushes pressure higher. While most health advice tells people to eat less salt, the opposite applies when your blood pressure runs too low. For people with orthostatic disorders (conditions where blood pressure drops upon standing), medical guidelines from the American Society of Hypertension recommend 2,400 to 4,000 mg of sodium per day. The Canadian Cardiovascular Society sets its target at about 4,000 mg daily. For context, the average American already eats around 3,400 mg, so reaching these levels may mean adding salty snacks, broth, pickles, olives, or simply salting your food more generously.
One study found that people who fainted from standing and had low sodium excretion saw real improvements in blood pressure control after just two months of adding roughly 2,400 mg of sodium per day to their diets. If you’re unsure where to start, adding 1,000 to 2,000 mg of sodium at each meal is a common clinical approach.
Water matters just as much as salt. Research from Vanderbilt University Medical Center found that plain water activates your sympathetic nervous system (your body’s “fight or flight” response), which raises blood pressure, alertness, and energy expenditure. The mechanism is surprisingly specific: water dilutes the salt concentration in blood vessels near the small intestine, triggering a pressure-raising reflex. Drinking two to three 16-ounce glasses of water throughout the day, on top of whatever else you drink, is a reasonable starting point.
Use Physical Maneuvers for Quick Relief
When you feel a dizzy spell coming on, certain muscle-tensing techniques can raise your blood pressure within seconds by squeezing blood from your legs and abdomen back toward your heart and brain. These are called counterpressure maneuvers, and they’re specifically recommended by the Cleveland Clinic for people prone to fainting.
- Leg crossing: Cross one leg over the other and squeeze the muscles in your legs, abdomen, and buttocks. Hold until the lightheadedness passes.
- Arm tensing: Grip one hand with the other and pull them in opposite directions without letting go. Maintain the tension as long as needed.
- Handgrip: Squeeze a rubber ball (or any firm object) in your dominant hand for as long as you can or until symptoms fade.
These techniques work best as a response to warning signs like tunnel vision, nausea, or feeling “floaty.” They’re not a long-term fix, but they can prevent a faint when you need a few extra seconds to sit or lie down.
Drink Caffeine Strategically
Caffeine raises blood pressure by constricting blood vessels and stimulating your heart. The effect is most noticeable if you don’t drink it regularly. A single cup of coffee can raise blood pressure by about 5 to 10 points within 30 minutes to two hours. If you deal with low blood pressure in the morning or after meals, a cup of coffee or tea timed around those moments can help. Just know that the effect diminishes with habitual use as your body adjusts.
Eat Smaller, Low-Carb Meals
Some people experience a blood pressure drop after eating, called postprandial hypotension. Normally, your heart rate increases after a meal so enough blood reaches your digestive system, while blood vessels elsewhere tighten to keep pressure stable. When that compensation fails, blood pools in your gut and pressure falls.
Two dietary shifts reduce this problem. First, eat six smaller meals throughout the day instead of three large ones, so your digestive system never demands a massive blood supply all at once. Second, keep those meals low in carbohydrates. Carbs trigger the largest blood flow shift to the gut, so replacing some of those carbs with protein and fat helps keep pressure steady after eating.
Wear Compression Garments
Compression stockings prevent blood from pooling in your legs when you stand, which is one of the most common triggers for low blood pressure symptoms. Most specialists recommend waist-high stockings rated at 20 to 30 mmHg or 30 to 40 mmHg of compression. Knee-high socks are easier to put on but less effective because a significant amount of blood pools in the thighs and abdomen, not just the calves. Abdominal binders are another option, particularly for people who find full-length stockings uncomfortable in warm weather.
Adjust How You Sleep
Sleeping completely flat can worsen morning blood pressure drops because your body spends all night without the gravitational cues that help regulate blood volume. Elevating the head of your bed by about 10 degrees (roughly 9 inches at the headboard) helps your kidneys retain more fluid overnight and reduces the dramatic pressure drop that hits when you first stand up in the morning. You can use bed risers or a foam wedge under the mattress. Stacking pillows doesn’t achieve the same effect because it bends your body at the waist rather than tilting it as a whole.
Medications for Persistent Low Blood Pressure
When lifestyle changes aren’t enough, two medications are most commonly prescribed. The first works by tightening blood vessels directly, acting on receptors that constrict arteries and veins to push pressure up. The second is a synthetic hormone that makes your kidneys hold onto sodium, expanding your blood volume and also amplifying the natural vessel-tightening signals your body already produces. Both have tradeoffs: the vessel-constricting medication can cause tingling or goosebumps, while the hormone-based one has been linked to higher rates of hospitalization in a large comparison study published in the Journal of the American Heart Association. Your doctor will choose based on the type and severity of your low blood pressure.
Signs Your Blood Pressure Is Dangerously Low
Most low blood pressure is more annoying than dangerous. But certain symptoms signal that your organs aren’t getting enough blood flow and need immediate attention: confusion or difficulty concentrating, cold and clammy skin, rapid shallow breathing, blurred vision, or feeling like you’re about to lose consciousness even while sitting or lying down. Fainting that happens repeatedly, especially without warning signs, also warrants urgent evaluation. These symptoms can indicate shock, severe dehydration, internal bleeding, or a heart problem that needs treatment beyond the strategies above.