Low blood pressure, defined as a reading below 90/60 mmHg, can cause dizziness, fatigue, and fainting that disrupts daily life. The good news is that a combination of dietary changes, physical strategies, and simple habit adjustments can meaningfully raise your numbers. Here’s what actually works.
Increase Your Salt and Fluid Intake
Salt is the single most effective dietary tool for raising blood pressure. It works by pulling more water into your bloodstream, increasing blood volume and, in turn, pressure against your vessel walls. For people with conditions like orthostatic hypotension or POTS, medical guidelines from organizations including the American Society of Hypertension recommend 2,400 to 4,000 mg of sodium per day, well above the 2,300 mg limit typically advised for the general population. Some specialists push even higher, to 4,000 to 4,800 mg daily, depending on how much sodium your body is actually retaining.
A practical approach is to add 1,000 to 2,000 mg of sodium to your diet three times a day through salted foods or electrolyte supplements. One study found that patients who added roughly 2,400 mg of supplemental sodium per day for two months saw improvements in their ability to stand without symptoms and in how well their blood vessels responded to position changes.
Water matters just as much as salt. Drinking water triggers a rapid rise in sympathetic nervous system activity, the branch of your nervous system that tightens blood vessels and raises heart rate. Research published in Circulation found that drinking about 480 mL (roughly 16 ounces) of water produced a stronger blood pressure increase than drinking half that amount. Aim for at least 2 to 3 liters of fluid per day, and consider drinking a full glass of water 15 minutes before standing up in the morning or before activities that trigger your symptoms.
Adjust How and What You Eat
Large meals can cause a sharp drop in blood pressure, a phenomenon called postprandial hypotension. Normally, after you eat, your heart rate increases and blood vessels throughout your body tighten to compensate for the blood being redirected to your digestive system. In people with low blood pressure, that compensation fails: the heart doesn’t speed up enough and the vessels don’t constrict properly, so pressure falls.
The fix is straightforward. Eat six smaller meals throughout the day instead of three large ones. Keep those meals low in carbohydrates, since carbs cause the most dramatic blood flow shifts to the gut. A meal built around protein, healthy fats, and non-starchy vegetables will produce a much smaller dip than a plate of pasta or a sandwich on white bread.
Use Physical Counterpressure Maneuvers
When you feel lightheaded or sense your blood pressure dropping, specific muscle-tensing techniques can buy you time by squeezing blood from your legs and abdomen back toward your heart and brain. These maneuvers have been shown to raise blood pressure and either control or abort fainting episodes.
- Leg crossing with tensing: Cross your legs at the ankles while simultaneously squeezing your thigh, buttock, and abdominal muscles. Hold for 30 seconds or until the lightheadedness passes.
- Hand gripping: Squeeze a rubber ball or any available object as hard as you can with your dominant hand. This maximal contraction activates a reflex that raises blood pressure throughout your body.
- Arm tensing: Grip one hand with the other in front of your chest and pull both arms outward while keeping your hands locked. This engages large muscle groups in both arms simultaneously.
These maneuvers work best when you use them at the first sign of symptoms, not after you’re already feeling faint. Practice them so they become automatic.
Wear Compression Garments
Blood pooling in the legs and abdomen is one of the main reasons blood pressure drops when you stand. Compression stockings counteract this by physically squeezing blood back into circulation. Most experts recommend garments rated at 20 to 30 mmHg or 30 to 40 mmHg of pressure.
The type matters as much as the pressure rating. Waist-high stockings are significantly more effective than knee-high ones because blood pools throughout the entire lower body, including the thighs and abdominal area. Knee-high stockings can actually cause visible swelling just above the knee where the compression ends, pushing the pooling problem upward rather than solving it. If waist-high garments feel too uncomfortable, thigh-highs are a reasonable compromise, but they won’t be as effective.
Caffeine as a Short-Term Boost
A cup of coffee can raise your blood pressure by up to 10 mmHg. The effect kicks in within about 30 minutes, peaks around an hour, then gradually fades. This makes caffeine a useful tool for specific situations, like drinking a cup before a morning commute or an event where you’ll be standing for a long time. It won’t solve chronic low blood pressure on its own, but it stacks well with other strategies. Timing it before meals may also help offset postprandial drops.
Sleep Position and Morning Routine
Low blood pressure tends to be worst in the morning because lying flat overnight allows blood to distribute evenly, and your body’s pressure-regulation reflexes are sluggish after hours of sleep. Raising the head of your bed by 10 to 20 degrees (about 6 to 12 inches at the headboard) trains your body to maintain some gravity-driven blood vessel tone even while you sleep. Use bed risers or a foam wedge rather than just extra pillows, which only elevate your neck.
When you wake up, sit on the edge of the bed for a minute or two before standing. Drink a glass of water while still seated. Flex your calves and feet several times to prime blood flow back toward your heart. These small steps can prevent the sudden blood pressure crash that causes morning dizziness.
Avoid Common Triggers
Certain everyday situations reliably lower blood pressure, and knowing your triggers lets you plan around them. Hot showers and baths dilate blood vessels and can cause dramatic drops; keep water lukewarm or finish with a cool rinse. Prolonged standing without movement allows blood to pool in your legs, so shift your weight, rise onto your toes, or use the leg-crossing technique described above. Alcohol is a vasodilator that compounds the problem, particularly on an empty stomach. Even mild dehydration from skipping fluids during a busy day can push already-low pressure into symptomatic territory.
When Medications Are Needed
If lifestyle changes aren’t enough, two medications are commonly prescribed. One works by helping your kidneys hold onto sodium and water, expanding your blood volume the same way dietary salt does but more powerfully. The other directly tightens blood vessels throughout your body, raising pressure mechanically. Your doctor will typically start with one and adjust based on how your symptoms respond. These medications are generally taken during the daytime hours when you’re upright and most vulnerable to drops, not at bedtime.
Red Flags That Need Immediate Attention
Most low blood pressure is manageable and not dangerous. But certain symptoms signal that your brain or heart isn’t getting enough blood flow and you should get to an emergency room: chest pain, loss of consciousness, or a fall from fainting where you hit your head. The head injury concern is especially important if you take blood-thinning medications, since even a seemingly minor bump can cause internal bleeding that’s hard to detect on your own.