Low blood pressure, defined as a reading below 90/60 mmHg, can cause dizziness, fatigue, and fainting. The good news is that several practical strategies can raise it, from simple dietary changes to physical techniques that work in seconds. Most people with chronically low blood pressure can manage it effectively without medication.
Drink More Water, and Drink It Strategically
Dehydration is one of the most common and fixable causes of low blood pressure. When your blood volume drops, there’s less fluid pushing against your artery walls, and your pressure falls. The goal for people managing low blood pressure is 2 to 2.5 liters of water per day.
Beyond daily intake, water can also work as a quick fix. Drinking about 500 mL (roughly two cups) of water in one sitting raises blood pressure within minutes. This “water bolus” works partly by expanding blood volume and partly by triggering a reflex that tightens blood vessels. If you tend to feel lightheaded before meals or after standing, drinking a glass or two of water beforehand can take the edge off.
Increase Your Salt Intake
This is the rare situation where adding salt to your diet is actually helpful. Salt helps your body hold onto water, which increases blood volume and raises pressure. For most people, a sodium intake in the range of 3 to 5 grams per day is associated with the lowest cardiovascular risk. That translates to roughly 7.5 to 12.5 grams of table salt, or about 1.5 to 2.5 teaspoons.
If you’ve been following a low-sodium diet (under 2.3 grams of sodium per day) and your blood pressure runs low, loosening that restriction could make a meaningful difference. You can increase salt through food choices like broth, pickles, olives, and salted nuts, or simply by salting your meals more generously. Intake below 3 grams of sodium per day is actually linked to higher cardiovascular risk in cohort studies, so there’s no reason to restrict salt when your pressure is already low.
Eat Smaller, More Frequent Meals
After you eat, your body diverts a large amount of blood to your digestive system to handle absorption. Normally, your nervous system compensates by tightening blood vessels elsewhere and slightly increasing your heart rate. But if that reflex is sluggish, which is more common in older adults and people with diabetes or Parkinson’s disease, blood pressure can drop significantly after meals. This is called postprandial hypotension.
The size of the meal matters. Larger meals require more blood flow to the gut, creating a bigger drop. In studies comparing six small meals to three large ones, the smaller meals caused a blood pressure drop of only 11 to 20 mmHg, significantly less than the drop after full-sized meals. High-carbohydrate meals tend to cause the steepest drops, partly because the insulin released in response to carbs promotes blood vessel relaxation. Shifting toward smaller portions spread throughout the day, with a focus on protein and fat over simple carbs, can keep post-meal dips to a minimum.
Use Physical Maneuvers for Quick Relief
When you feel blood pressure dropping, whether from standing up too fast or standing in line too long, certain body movements can push it back up within seconds. These work by squeezing your leg and abdominal muscles, which forces pooled blood back toward your heart.
The most effective options, based on measured blood pressure responses:
- Squatting: The single most effective quick fix. Squatting with your head between your knees (the “crash position”) reliably restores blood pressure during near-fainting episodes.
- Crossing your legs and tensing: While standing, cross your legs and squeeze your thigh, buttock, and abdominal muscles. This produced some of the largest pressure increases in studies of people prone to fainting.
- Marching in place or doing calf raises: Activating your calf muscles pumps blood upward. Even fidgeting your legs while standing helps.
- Tensing your arms: Gripping one hand with the other and pulling outward, or squeezing a stress ball, raises systolic pressure noticeably.
These aren’t just theoretical. In clinical tracings, all three major maneuvers (squatting, leg crossing with tensing, and the crash position) successfully restored blood pressure during actual episodes of lightheadedness with visible pallor and sweating.
Try Caffeine, Especially Before Meals
Caffeine raises blood pressure by constricting blood vessels. A dose of about 250 mg, roughly the amount in two to three cups of coffee, raised blood pressure by an average of 12/6 mmHg in a study published in the New England Journal of Medicine. More importantly, caffeine cut the post-meal blood pressure drop nearly in half, and this benefit held up after a full week of daily use.
If your worst symptoms happen after eating, a cup or two of coffee with your meal is a practical strategy. Caffeine works through a different pathway than the nervous system adjustments your body normally uses after meals, so it’s effective even when those reflexes aren’t functioning well.
Wear Compression Garments
Compression stockings prevent blood from pooling in your legs when you stand. The Mayo Clinic recommends waist-high compression stockings rather than knee-high ones for managing blood pressure drops, since a significant amount of blood can pool in the thighs and abdomen, not just the calves. Wear them during the day and remove them when lying down or sleeping.
Abdominal compression binders serve a similar purpose. For some people, an abdominal binder alone is easier to tolerate than full-length stockings, especially in warm weather, and still provides meaningful support by reducing blood pooling in the gut area.
Medications for Persistent Low Blood Pressure
When lifestyle changes aren’t enough, two medications are commonly prescribed. One promotes sodium retention, causing your body to hold onto more water and expand blood volume. The other directly tightens blood vessels, raising pressure through increased resistance. The blood vessel-tightening medication tends to be preferred because the sodium-retaining option carries a higher risk of hospitalization, particularly for people with any degree of heart failure.
Medication is typically reserved for people whose low blood pressure significantly affects daily life or causes repeated falls, especially older adults with conditions that impair the nervous system’s ability to regulate blood pressure on its own.
Signs That Low Blood Pressure Is an Emergency
Most low blood pressure is manageable and not dangerous. But a sudden, severe drop can lead to shock, where your organs aren’t getting enough blood flow. The warning signs are cold and sweaty skin, rapid breathing, a blue or grayish skin tone, and a weak, rapid pulse. If you notice these signs in yourself or someone else, call 911 immediately. This pattern typically results from severe dehydration, blood loss, serious infection, or an allergic reaction, not from the kind of chronic low blood pressure that responds to the strategies above.