If your blood pressure consistently reads below 90/60 mmHg and you’re dealing with dizziness, fatigue, or fainting, there are several effective ways to bring it up. Some work within minutes, others build over days and weeks. The right approach depends on whether you need a quick fix in the moment or a longer-term strategy.
Drink More Water, and Drink It Quickly
Water raises blood pressure faster than most people expect. Research published in the American Heart Association’s journal Circulation found that drinking about 16 ounces (480 mL) of water triggers a measurable rise in blood pressure within five minutes. The effect peaks around 30 to 35 minutes and lasts over an hour. This happens because water stimulates your sympathetic nervous system, the same fight-or-flight pathway activated by caffeine and nicotine, which tightens blood vessels and pushes pressure up.
Drinking a larger volume produces a stronger response than sipping small amounts, so downing a full glass or two when you feel lightheaded is more effective than taking tiny sips throughout the hour. For day-to-day management, staying consistently well-hydrated keeps your blood volume higher, which supports steadier pressure readings overall.
Increase Your Salt Intake
Salt helps your body retain water, which expands blood volume and raises pressure. This is the opposite of the advice given to people with high blood pressure, but if yours runs low, extra sodium can make a real difference. Some physicians recommend at least 6 grams of salt per day for people with low blood pressure, which is roughly one teaspoon. You can get there by salting your meals more liberally, eating broth-based soups, or snacking on salted nuts and pretzels.
If you have kidney disease or heart failure, increasing salt without medical guidance can cause problems, so this strategy works best when you’ve confirmed your low readings with a doctor and ruled out conditions where extra sodium would be harmful.
Use Physical Counterpressure Maneuvers
When you feel a sudden wave of dizziness or sense your blood pressure dropping, specific muscle-tensing techniques can push it back up in seconds. The American Heart Association recommends several:
- Leg crossing with tensing: Cross your legs and squeeze your leg, abdominal, and buttock muscles simultaneously. You can do this lying down or standing.
- Squatting: Lower yourself into a squat and tense your lower body and abdomen. Stay there until symptoms pass, then stand slowly.
- Isometric handgrip: Grip your opposing hands with interlocked fingers and pull your arms in opposite directions as hard as you can.
- Fist clenching: Make a tight fist at maximum contraction, with or without something in your hand.
These maneuvers work by compressing blood vessels and forcing blood back toward your heart and brain. They’re especially useful if you tend to get lightheaded when standing up quickly or after being on your feet for a while.
Wear Compression Garments
Compression stockings prevent blood from pooling in your legs, which is one of the most common reasons blood pressure drops when you stand. Experts in autonomic disorders recommend waist-high stockings rated at 20 to 30 mmHg or 30 to 40 mmHg of pressure. Knee-high stockings are easier to put on but less effective because they don’t compress the large veins in your thighs.
The garments work best when you put them on first thing in the morning before getting out of bed, since blood hasn’t yet settled into your lower body. They can feel tight and warm, especially in summer, but for people whose blood pressure drops significantly upon standing, the improvement in symptoms is often worth the discomfort.
Have Caffeine Strategically
Caffeine raises blood pressure by about 5 to 10 points in people who don’t drink it regularly. A cup of coffee or strong tea before meals or before activities that trigger lightheadedness can provide a temporary boost. The effect kicks in within 30 minutes and can be measured for up to two hours afterward.
If you already drink coffee daily, your body has likely adapted and the pressure-raising effect will be smaller. For the best results, use caffeine selectively rather than constantly, so your body doesn’t fully adjust to it.
Eat Smaller, More Frequent Meals
Large meals can cause a noticeable blood pressure drop, a condition called postprandial hypotension. After eating, your heart rate normally increases and blood vessels throughout your body tighten to compensate for the extra blood flow directed to your digestive system. When that compensatory response doesn’t work well, pressure falls and you feel drowsy, dizzy, or faint.
Switching from three large meals to six smaller ones reduces the amount of blood your gut demands at any one time, keeping your pressure more stable. Meals heavy in refined carbohydrates tend to cause the biggest drops, so pairing carbs with protein and fat also helps blunt the effect.
Elevate the Head of Your Bed
Sleeping with the head of your bed raised about six inches trains your body to retain more fluid and maintain higher pressure during the day. You can achieve this by placing blocks or risers under the legs at the head of the bed, not by stacking pillows (which bends your neck without changing the angle of your whole body). Over several weeks, this position encourages your kidneys to hold onto more sodium and water overnight, which supports blood volume during waking hours.
Prescription Options for Persistent Low BP
When lifestyle changes aren’t enough, two medications are commonly prescribed. One works by tightening blood vessels directly, giving a short-acting boost in pressure that’s taken three times a day. The other is a synthetic hormone that tells your kidneys to hold onto more sodium, expanding your blood volume and also making blood vessels more responsive to tightening signals. Both require careful dose adjustments, and your doctor will typically start low and increase gradually based on your readings and symptoms.
Medications are generally reserved for people whose low blood pressure causes frequent fainting or significantly limits daily activities, not for occasional mild dizziness.
Red Flags That Need Immediate Attention
Low blood pressure is usually manageable, but certain symptoms signal something more serious: fainting repeatedly, chest pain, shortness of breath, severe or sudden-onset dizziness, or confusion. Black or tarry stools alongside low pressure readings can indicate internal bleeding. These situations need emergency evaluation, not home remedies.