Low blood pressure, generally defined as a reading below 90/60 mmHg, can cause dizziness, fatigue, and fainting. Raising it involves a combination of dietary changes, physical techniques, and lifestyle adjustments that help your body maintain adequate pressure throughout the day. Some strategies work within minutes, while others build your baseline over weeks.
Drink More Water, and Drink It Quickly
One of the fastest ways to raise blood pressure is simply drinking water. Research published in the American Heart Association journal Circulation found that drinking about 16 ounces (480 mL) of water produced a measurable increase in blood pressure within five minutes, peaked around 30 to 35 minutes, and lasted over an hour. Drinking the full 16 ounces caused a stronger response than drinking only 8 ounces. This works because a bolus of water expands your blood volume and triggers a nerve reflex that tightens blood vessels.
If you deal with chronically low blood pressure, keeping a water bottle with you and drinking consistently throughout the day helps prevent the kind of volume depletion that makes symptoms worse. Many people with low blood pressure are simply under-hydrated without realizing it.
Increase Your Salt Intake
While most health advice tells people to eat less sodium, the opposite applies when your blood pressure runs too low. Salt helps your body retain fluid, which increases the volume of blood circulating through your vessels. Guidelines from several cardiovascular societies recommend that people with orthostatic hypotension consume between 4,000 and 4,800 mg of sodium per day, and some recommendations go as high as 8,000 mg for certain conditions. For context, the average American consumes about 3,400 mg daily.
Practical ways to add sodium include salting your food more liberally, eating pickles, olives, broth-based soups, or adding electrolyte drinks to your routine. Some people add 1,000 to 2,000 mg of supplemental sodium with each meal. If you have kidney disease or heart failure, this approach may not be safe, so it’s worth discussing with your doctor first.
Use Physical Counterpressure Maneuvers
When you feel a blood pressure drop coming on (lightheadedness on standing, tunnel vision, or wooziness), certain muscle-tensing techniques can quickly push blood back toward your heart and brain. The American Heart Association recommends several of these:
- Leg crossing with muscle tensing: Cross your legs and squeeze your thigh, buttock, and abdominal muscles simultaneously. You can do this while standing or lying down.
- Squatting: Lower yourself into a squat, which compresses the blood vessels in your legs and forces blood upward. Tense your lower body and abdomen while you hold the position.
- Arm tensing: Grip your hands together, fingers interlocked, and pull in opposite directions as hard as you can. Alternatively, clench your fists at maximum force.
These techniques are especially useful for orthostatic hypotension, the type where your blood pressure drops suddenly when you stand up from sitting or lying down. They’re free, discreet enough to use in public, and work within seconds.
Adjust How You Eat
Blood pressure naturally dips after meals as your body diverts blood flow to the digestive system. This is called postprandial hypotension, and it can cause significant lightheadedness, especially in older adults. Three changes help prevent it:
First, eat smaller meals more frequently. Six smaller meals spread through the day cause less blood flow diversion than three large ones. Second, reduce the carbohydrate content of your meals. Carb-heavy meals (pasta, bread, rice, potatoes) tend to cause larger post-meal blood pressure drops than meals built around protein and fat. Third, take a 10-minute walk after eating. Light movement keeps blood circulating through your body rather than pooling in your gut.
Try Caffeine Strategically
Caffeine can raise blood pressure by 5 to 10 points in people who don’t consume it regularly. It works by narrowing blood vessels and stimulating your adrenal glands to release adrenaline. A cup of coffee or tea before a meal or before a situation where you know you’ll be standing for a long time can provide a temporary boost.
The catch is that regular caffeine drinkers develop a tolerance, so the blood pressure effect diminishes over time. If you already drink coffee daily, it probably isn’t doing much for your blood pressure anymore. To check whether caffeine helps you specifically, measure your blood pressure before a cup of coffee and again 30 to 120 minutes afterward.
Wear Compression Garments
Compression stockings prevent blood from pooling in your lower body, which is one of the main reasons blood pressure drops when you stand. Most experts recommend waist-high compression stockings rated at 20 to 30 mmHg or 30 to 40 mmHg of pressure. Waist-high is important because blood pools not just in the calves but throughout the thighs and abdominal area. Knee-high socks or casual compression leggings may not provide enough pressure to make a meaningful difference.
Compression garments work best when combined with other strategies like increased fluids and salt. They’re particularly helpful on days when you’ll be standing for long periods or in hot environments, both of which worsen low blood pressure.
Change How You Get Out of Bed
Many people with low blood pressure feel worst first thing in the morning. Overnight, your body redistributes fluid while you’re lying flat, and the sudden shift to standing can cause a steep pressure drop. A few habits help with this transition.
Sit on the edge of the bed for 30 to 60 seconds before standing. Pump your ankles and tense your leg muscles while sitting to get blood moving. Keep a glass of water on your nightstand and drink it before you stand up. Some specialists recommend elevating the head of your bed by a few inches (placing blocks under the headboard legs) so your body maintains a slight tilt overnight, which reduces the fluid shifts that make mornings difficult.
Medications for Persistent Low Blood Pressure
When lifestyle changes aren’t enough, two FDA-approved medications are commonly prescribed for orthostatic hypotension. Midodrine works by tightening blood vessels to increase resistance, which pushes pressure up. Droxidopa takes a different path, boosting levels of a chemical messenger that constricts blood vessels. Both are taken multiple times daily and should be avoided within a few hours of bedtime because they can cause blood pressure to spike while you’re lying down.
A third option, fludrocortisone, works by helping your kidneys retain more sodium and water, expanding your total blood volume. It’s used off-label for this purpose. Several other off-label medications exist for cases that don’t respond to first-line treatments.
These medications are typically reserved for people who’ve already tried the hydration, salt, compression, and countermaneuver strategies without adequate relief. The goal is usually to reduce symptoms like dizziness and fainting rather than to hit a specific blood pressure number.
Warning Signs That Need Immediate Attention
Mild low blood pressure that causes occasional lightheadedness is common and manageable. But certain symptoms alongside low blood pressure suggest something more serious: confusion or difficulty thinking clearly, cold and clammy skin, rapid shallow breathing, blurred vision, or fainting. A sudden, significant drop in blood pressure can indicate dehydration, blood loss, a severe infection, or an allergic reaction, all of which need prompt medical evaluation.