Low blood pressure, generally defined as a reading below 90/60 mmHg, can cause dizziness, fatigue, lightheadedness, and fainting. The good news is that most cases respond well to straightforward lifestyle changes: increasing salt and fluid intake, adjusting how you eat, and using simple physical techniques to keep blood from pooling in your legs. Here’s what actually works.
Increase Your Salt and Fluid Intake
Salt is the single most effective dietary tool for raising blood pressure, because sodium helps your body hold onto water, which increases blood volume. For people with orthostatic disorders (where blood pressure drops when standing), the American Society of Hypertension recommends 2,400 to 4,000 mg of sodium per day, while the Canadian Cardiovascular Society and other groups suggest around 4,000 mg daily. Some specialists go higher, recommending 4,000 to 8,000 mg for more severe cases. For context, the average American already consumes about 3,400 mg per day, so you may only need a modest increase.
A practical approach is to add 1,000 to 2,000 mg of sodium to your diet at each meal. You can do this by salting food more liberally, eating salty snacks like olives or pickles, or drinking broth. If you’re not sure whether you need more salt, a 24-hour urine sodium test can help your doctor determine your baseline.
Fluid intake matters just as much. Aim for 2 to 2.5 liters of water per day to counteract normal urinary losses and maintain blood volume. Drinking water also has an acute effect: it can temporarily improve your ability to tolerate standing upright. Spread your intake throughout the day rather than drinking large amounts at once, and keep a water bottle nearby as a visual reminder.
Adjust How and What You Eat
Blood pressure naturally dips after meals as your body redirects blood flow to your digestive system. This is called postprandial hypotension, and it’s especially common in older adults. Large, carbohydrate-heavy meals make it worse because carbs trigger a bigger digestive response.
Two changes help. First, eat smaller meals more frequently, six modest meals instead of three large ones. Second, reduce carbohydrates at each sitting. You don’t need to go low-carb overall, just avoid loading up on bread, pasta, or rice in a single meal. Pairing carbs with protein, fat, and fiber slows digestion and blunts the post-meal blood pressure drop.
Use Physical Counter-Pressure Maneuvers
When you feel lightheaded or sense your blood pressure dropping, specific body movements can push blood back toward your heart and raise your pressure within seconds. The American Heart Association recommends several techniques:
- Leg crossing with muscle tensing. Cross your legs at the ankles and squeeze your leg, abdominal, and buttock muscles simultaneously. You can do this standing or lying down.
- Squatting. Lower yourself into a full squat, which compresses the veins in your legs and forces blood upward. Tense your lower body and abdomen while squatting, then stand slowly once symptoms pass.
- Hand gripping. Grip your hands together, interlocking your fingers, and pull your arms in opposite directions with maximum force. This isometric contraction raises blood pressure quickly.
- Fist clenching. Squeeze a fist as hard as you can, with or without holding a small object like a rubber ball.
These maneuvers work best as an immediate response to symptoms. They’re not a long-term fix, but they can prevent fainting episodes and buy you time to sit down, drink water, or change position safely.
Wear Compression Stockings
Compression stockings gently squeeze your lower legs, preventing blood from pooling in your veins. According to Cleveland Clinic cardiologist Luke Laffin, they typically raise blood pressure by about 5 to 10 mmHg. That may sound modest, but for someone hovering near the threshold of symptoms, it can be the difference between feeling fine and feeling faint.
Knee-high stockings help, but waist-high versions are more effective because they also compress the thighs and abdomen. Put them on first thing in the morning before you stand up, since that’s when blood pooling is most likely to start. They can feel tight and warm, especially in summer, but most people adjust within a week or two.
Use Caffeine Strategically
Coffee and tea can raise blood pressure by about 5 to 10 points in people who don’t consume caffeine regularly. The effect kicks in within 30 minutes and can last up to two hours. If you already drink coffee daily, you’ve likely built a tolerance and won’t see much of a bump. But if you’re not a regular caffeine consumer, a cup of coffee with breakfast or before a period of prolonged standing can provide a helpful short-term boost.
One timing tip: drinking coffee with meals can also help counteract the post-meal blood pressure dip described above, giving you a double benefit.
Change Positions Slowly
Many people with low blood pressure notice it most when standing up from a seated or lying position. This happens because gravity pulls blood into your legs faster than your body can compensate. A few habits reduce this effect significantly. Sit on the edge of your bed for 30 to 60 seconds before standing in the morning. When getting up from a chair, pause halfway. Avoid standing motionless for long periods, and if you must, shift your weight, rock on your heels, or flex your calves to keep blood circulating.
Sleeping with the head of your bed elevated by 10 to 15 degrees (about 4 to 6 inches) can also help. This position reduces the dramatic fluid shift that happens when you go from lying flat to upright, training your body to maintain pressure more effectively.
Check for Nutritional Deficiencies
Vitamin B12 deficiency has been linked to recurrent fainting episodes. Research published in the European Heart Journal found that people who experienced frequent vasovagal syncope (the medical term for fainting triggered by a sudden blood pressure drop) had significantly lower B12 levels compared to those with fewer episodes. B12 deficiency can also cause anemia, which reduces the blood’s oxygen-carrying capacity and worsens low blood pressure symptoms.
If you follow a vegetarian or vegan diet, are over 60, or take medications that reduce stomach acid, you’re at higher risk for B12 deficiency. A simple blood test can check your levels, and supplementation through pills or injections corrects the problem relatively quickly.
Know When Low Blood Pressure Needs Medical Treatment
Lifestyle changes are the first line of defense, and they work well for most people with mildly low blood pressure. But if you’re still experiencing frequent dizziness, fainting, or near-fainting despite consistent salt intake, adequate fluids, and compression stockings, prescription medications can help. These typically work by either tightening blood vessels or helping your kidneys retain more sodium and fluid. Your doctor can determine whether medication is appropriate based on how much your symptoms interfere with daily life and whether an underlying condition is contributing.
Symptoms that warrant prompt medical attention include confusion, cold or clammy skin, rapid shallow breathing, or a weak and rapid pulse. These can indicate that blood pressure has dropped low enough to compromise blood flow to your organs, which requires immediate evaluation.