The fastest way to raise low blood pressure is to lie down and elevate your legs above heart level while drinking water. This combination works within minutes by redirecting blood flow to your core and brain. Beyond that, several other techniques can bring your numbers up quickly, depending on what’s causing the drop.
Low blood pressure doesn’t have a single universal cutoff, but readings below 90/60 mmHg with symptoms like dizziness, blurred vision, or feeling faint generally signal a problem worth addressing. A sudden drop of 20 points systolic or 10 points diastolic when you stand up is also considered significant.
Change Your Body Position First
If you feel lightheaded or dizzy, lie flat and prop your feet up on a pillow, chair, or wall. This shifts blood from your legs back toward your heart and brain, often relieving symptoms in under a minute. If you can’t lie down, sit and put your head between your knees.
If you’re standing and feel a faint coming on, physical counterpressure maneuvers can stabilize your blood pressure before you go down. These have been shown to abort fainting episodes in clinical settings and work by squeezing blood out of large muscle groups back into circulation:
- Leg crossing with tensing: Cross your legs at the ankles while tightly squeezing your thigh, buttock, and abdominal muscles. Hold for at least 30 seconds.
- Hand gripping: Squeeze a ball, water bottle, or any solid object as hard as you can with your dominant hand.
- Arm tensing: Grip one hand with the other in front of your chest and pull outward with both arms simultaneously, as if trying to pull them apart.
These maneuvers buy you time. They’re especially useful if you tend to feel faint after standing too long, standing up quickly, or being in hot environments.
Drink Water, and Drink Enough
Plain water raises blood pressure through a reflex that activates your nervous system. Research published in Circulation found that drinking about 480 mL (roughly 16 ounces, or two standard glasses) raised systolic blood pressure by 11 mmHg in healthy older adults. In people with autonomic nervous system problems, the same amount raised it by 43 mmHg. Drinking half that volume produced a noticeably smaller effect, so a full 16 ounces is the target.
This works even if you weren’t dehydrated beforehand, though dehydration makes low blood pressure worse. If you’ve been sweating, skipping fluids, or had a stomach illness, you may need substantially more than 16 ounces to recover your blood volume.
Add Salt to Speed Things Up
Sodium pulls water into your bloodstream, increasing blood volume and raising pressure. If your blood pressure is acutely low, eating something salty can help: a handful of salted nuts, a few olives, a cup of broth, or a pinch of salt dissolved in water. Sports drinks with electrolytes work too, combining both fluid and sodium in one step.
This matters most for people who eat low-sodium diets or who have been losing fluids through sweat or illness. The effect takes longer than body positioning (think 15 to 30 minutes rather than seconds), but it lasts longer because you’re actually expanding your blood volume rather than just redistributing it.
Caffeine as a Short-Term Boost
A cup of coffee or strong tea can raise blood pressure by 5 to 15 mmHg within 30 minutes. Caffeine constricts blood vessels and briefly increases heart rate. This effect is strongest in people who don’t drink caffeine regularly. If you’re a daily coffee drinker, your body has already adapted and you’ll see a smaller bump.
Caffeine also acts as a mild diuretic, so pair it with water if you’re already low on fluids.
Compression Garments for Ongoing Support
If low blood pressure is a recurring problem for you, compression can help prevent drops. Abdominal binders are more effective than compression stockings alone, because the abdominal area holds a much larger reservoir of blood. Squeezing that area pushes blood back to your heart more efficiently than compressing just your legs.
The effective compression level is 20 to 40 mmHg, which means drugstore compression socks won’t do much on their own. Medical-grade abdominal binders or waist-high compression garments are more useful, though they can be difficult to put on and uncomfortable to wear for long periods.
Eating Patterns That Prevent Drops
Large meals divert blood to your digestive system, which can cause blood pressure to fall noticeably afterward. This is called postprandial hypotension, and it’s especially common in older adults. Eating smaller, more frequent meals reduces the size of each blood flow shift. Cutting back on refined carbohydrates at meals also helps, since high-carb foods tend to produce bigger drops.
Avoid alcohol if low blood pressure is a concern. Alcohol dilates blood vessels and acts as a diuretic, both of which lower pressure further.
When Low Blood Pressure Is an Emergency
Most episodes of low blood pressure are uncomfortable but not dangerous. However, certain signs indicate your body is losing the ability to compensate, and you need emergency help immediately:
- Confusion or difficulty staying alert: Your brain isn’t getting enough blood flow.
- Cold, pale, or clammy skin: Your body is redirecting blood away from your extremities.
- Rapid heart rate above 100 beats per minute: Your heart is working overtime to compensate.
- Rapid, shallow breathing
- Very little or no urine output
- Bluish tint to lips, fingertips, or nail beds
These are signs of shock, a condition where organs aren’t receiving enough blood to function. Shock can result from severe dehydration, blood loss, serious infection, allergic reactions, or heart problems. If someone shows these symptoms alongside a systolic reading below 90 mmHg, call emergency services. While waiting, lay the person flat with their legs elevated and keep them warm.