Drinking about two cups (480 mL) of water is one of the fastest ways to raise low blood pressure, with a measurable increase starting within five minutes and peaking around 30 to 35 minutes later. But water is just one option. Several physical techniques, dietary changes, and longer-term strategies can bring your numbers up, depending on whether you’re dealing with a sudden drop or chronically low readings. Low blood pressure is generally defined as a reading below 90/60 mmHg.
Drink Water First
Plain water triggers a surprisingly strong blood pressure response. Research published by the American Heart Association found that drinking 480 mL (about 16 ounces, or two standard glasses) raised systolic blood pressure by an average of 11 mmHg in older adults. The effect kicked in within five minutes, peaked at roughly 30 to 35 minutes, and lasted over an hour. Drinking a smaller amount (240 mL, or one glass) still helped, but produced a weaker response.
This works because water expands your blood volume and activates your nervous system’s pressure-regulating reflexes. If you’re feeling lightheaded or woozy, drinking two glasses of water quickly is a solid first move while you try other strategies.
Use Physical Counter-Pressure Maneuvers
These are simple muscle-tensing techniques you can do anywhere, and they work fast. Crossing your legs and squeezing your thighs together, clenching your fists, or tensing your abdominal muscles all push blood from your limbs and core back toward your heart, raising cardiac output. A meta-analysis in Autonomic Neuroscience found these maneuvers reduced the odds of fainting by about 70% compared to doing nothing.
The most effective options include:
- Leg crossing with thigh tensing: Cross one leg over the other and squeeze both thighs together firmly. Hold for 30 seconds or longer.
- Squatting: Drop into a full squat. This compresses the large blood vessels in your legs and forces blood upward. It’s one of the fastest physical fixes if you feel a dizzy spell coming on.
- Hand gripping: Squeeze a stress ball or clench your fists tightly and hold for several seconds, then release and repeat.
These techniques are especially useful for orthostatic hypotension, the type of blood pressure drop that happens when you stand up too quickly.
Lie Down, but Skip the Head-Down Position
If your blood pressure drops suddenly and you feel faint, lying flat on your back is the right call. But tilting your body so your head is lower than your feet (the Trendelenburg position) is not as helpful as many people assume. A systematic review found that in 9 out of 11 patients studied, this head-down tilt actually reduced blood pressure further while also compressing the lungs and making breathing harder. Both the American Heart Association and the National Association of EMTs now discourage it for people in shock or with low blood pressure.
Simply lying flat and elevating your legs slightly (propping your feet on a pillow or chair) is a safer approach. Once you feel steadier, sit up slowly before standing.
Eat Something Salty
Sodium raises blood pressure by pulling water into your bloodstream and increasing blood volume. For someone with chronically low blood pressure, adding salt to meals or snacking on salty foods like olives, broth, pickles, or salted nuts can provide a noticeable boost. This isn’t an instant fix the way water or squatting is, but over the course of a day, higher salt intake reliably raises readings.
Research on salt sensitivity shows that shifting from a very low-salt diet to a higher one can increase mean blood pressure by 10% or more within about a week. For people with low blood pressure, this is a feature rather than a bug. If you’re otherwise healthy and your doctor hasn’t restricted your sodium, salting your food more liberally is one of the simplest long-term strategies.
Have a Cup of Coffee
Caffeine causes a short-term spike in blood pressure, even in people who don’t normally have high readings. The effect typically shows up within 30 minutes and can last one to two hours. A standard cup of coffee contains roughly 80 to 100 mg of caffeine, and the FDA considers up to 400 mg daily safe for most adults.
Caffeine is most useful as a quick fix before activities that tend to trigger drops, like standing for long periods or exercising in heat. If you drink coffee regularly, though, your body builds some tolerance to the blood pressure effect, so it may be less reliable as a daily strategy.
Wear Compression Stockings
Compression stockings squeeze the veins in your lower legs, preventing blood from pooling there and pushing it back toward your heart. A study on women with low blood pressure (systolic readings at or below 100 mmHg) found that wearing compression stockings significantly raised their resting blood pressure and reduced the drop that normally occurs when standing up. Interestingly, the stockings had no meaningful effect on women whose blood pressure was already normal, suggesting they specifically help people who need the boost.
These are a good option if you deal with low blood pressure regularly, especially first thing in the morning or during long periods on your feet. Knee-high stockings are typically sufficient. Put them on before getting out of bed if mornings are your worst time.
Prescription Options for Chronic Low Blood Pressure
If lifestyle changes aren’t enough, two medications are currently approved for treating orthostatic hypotension. One (midodrine) works by tightening blood vessels to push pressure up. The other (fludrocortisone) helps your body retain sodium and water, increasing blood volume. Both require a prescription and ongoing monitoring, since they can overshoot and cause high blood pressure in certain positions.
Doctors also look at your existing medications as a potential cause. Blood pressure drugs, certain antidepressants, and prostate medications (alpha-blockers) are common culprits. Sometimes the fix is simply adjusting or switching one of these rather than adding a new drug. The American Heart Association considers these nonpharmacological and medication-review approaches first-line treatment for orthostatic hypotension.
When Low Blood Pressure Is an Emergency
Most low blood pressure is uncomfortable but not dangerous. It becomes an emergency when it’s accompanied by confusion, cold or clammy skin, rapid shallow breathing, a weak and fast pulse, or blurred vision that doesn’t improve when you sit or lie down. These signs can indicate shock, meaning your organs aren’t getting enough blood flow. If you or someone near you has these symptoms, call emergency services immediately rather than trying home remedies.