Dizziness when you stand up happens because blood temporarily pools in your legs and abdomen, dropping the amount that reaches your brain. In most cases, simple changes to how you stand, what you drink, and what you eat can significantly reduce or eliminate it. The medical term is orthostatic hypotension, diagnosed when your systolic blood pressure drops by 20 mmHg or more, or your diastolic drops by 10 mmHg or more, within three minutes of standing.
Why It Happens
When you’re sitting or lying down, gravity isn’t pulling much blood away from your brain. The moment you stand, roughly 300 to 800 milliliters of blood shifts downward into your legs and torso. Your body normally compensates within seconds: blood vessels tighten, your heart rate ticks up, and blood pressure stays stable. When that reflex is too slow or too weak, your brain briefly loses adequate blood flow, and you feel lightheaded, see spots, or even black out.
Several things interfere with this reflex. Dehydration is the most common culprit, because low blood volume means there’s less blood available to redirect. Medications for high blood pressure, heart disease, depression, Parkinson’s disease, and prostate conditions (particularly diuretics, beta blockers, alpha blockers, and calcium channel blockers) can all blunt the body’s ability to adjust. Prolonged bed rest, hot weather, alcohol, and aging itself also contribute. If you’re on any of these medications and regularly feel dizzy when standing, that’s worth bringing up with your prescriber, since a dose adjustment or timing change can sometimes fix the problem entirely.
Stand Up in Stages
The single most effective habit change is to stop going from flat on your back to fully upright in one motion. Instead, break it into steps: sit up in bed first and stay there for 15 to 30 seconds. Then move your feet to the floor and sit on the edge of the bed for another 15 to 30 seconds. Finally, rise to standing. This gives your cardiovascular system time to adjust at each stage rather than demanding a full correction all at once. The same principle applies when getting up from a chair or a couch: pause before you walk.
Counterpressure Moves That Work Immediately
If dizziness hits while you’re already on your feet, specific muscle contractions can push pooled blood back toward your heart and brain. These are called counterpressure maneuvers, and Cleveland Clinic recommends practicing them even when you feel fine so they become automatic.
- Leg crossing and squeezing: Cross one leg over the other and tighten the muscles in your legs, abdomen, and buttocks. Hold until the dizziness passes.
- Arm tensing: Grip one hand with the other and pull them against each other without letting go. This raises blood pressure within seconds.
- Handgrip: Squeeze a rubber ball (or just make a tight fist) with your dominant hand and hold it as long as needed.
These aren’t subtle. You’re deliberately creating full-body muscle tension that forces blood upward. They work best when you start them at the first hint of lightheadedness rather than waiting until your vision is already tunneling.
Drink More Water Than You Think You Need
Fluid intake has an outsized effect on standing blood pressure. The American Heart Association recommends 2 to 3 liters of fluid per day for people prone to orthostatic dizziness. That’s roughly 8 to 12 cups. Even a single large glass of water can measurably improve your ability to tolerate standing within minutes. One AHA study found that drinking about 500 milliliters (roughly 16 ounces) of water acutely improved standing tolerance in healthy subjects.
Timing matters too. Drinking a full glass of water 10 to 15 minutes before you plan to get up, especially first thing in the morning when you’re most dehydrated, can preempt the worst episodes.
Salt: More May Be Better
For most health conditions, people are told to cut back on salt. Orthostatic dizziness is an exception. Salt helps your body retain fluid, which increases blood volume. Medical guidelines for people with confirmed orthostatic hypotension recommend 2,400 to 4,000 milligrams of sodium per day, and some specialists push that to 4,000 to 8,000 milligrams for more severe cases. For context, the average American consumes about 3,400 milligrams daily.
One study found that people with fainting episodes who added roughly 2,400 milligrams of supplemental sodium to their daily diet for two months saw meaningful improvements in their ability to stand without symptoms. Practical ways to increase salt include adding it to meals, drinking broth, eating pickles or olives, or using electrolyte tablets. If you have high blood pressure, kidney disease, or heart failure, increasing salt isn’t appropriate without medical guidance.
Watch What and How Much You Eat
Large meals can trigger their own form of blood pressure drop. During digestion, your body diverts extra blood to your stomach and small intestine. Normally, your heart compensates by beating harder and your blood vessels tighten elsewhere. In some people, this compensation fails, and blood pressure drops everywhere except the gut.
Foods that pass quickly from the stomach to the small intestine make this worse: white bread, white rice, potatoes, and sugary drinks are the biggest offenders. The rapid absorption triggers a sharper, faster blood pressure dip. Switching from three large meals to five or six smaller ones spreads out the digestive workload and reduces the blood flow diversion at any given time. Avoiding standing or walking immediately after a large meal also helps.
Compression Garments: What Actually Works
Compression stockings are frequently recommended, but the type matters more than most people realize. A systematic review in the Netherlands Journal of Medicine found that knee-high compression stockings, the kind most people buy, did not meaningfully reduce blood pressure drops on standing. Full-length compression covering the legs and abdomen, or abdominal compression alone, were the only types that significantly helped. The reason is straightforward: most of the blood that pools when you stand collects in the abdomen, not just the calves.
If you want to try compression, look for an abdominal binder or full-body compression garment rather than standard knee-high stockings. Compression levels used in studies ranged from 20 to 40 mmHg, with most effective results at 30 mmHg or higher.
When Dizziness Points to Something Else
Occasional lightheadedness when you stand after lying down for a while, especially on a hot day or when you haven’t had enough water, is common and usually harmless. But certain patterns suggest something more is going on.
A related condition called POTS (postural orthostatic tachycardia syndrome) causes your heart rate to jump by 30 beats per minute or more within 10 minutes of standing, without the blood pressure drop seen in orthostatic hypotension. People with POTS often feel dizzy, fatigued, and shaky when upright, and it primarily affects younger adults. If your dizziness comes with a pounding or racing heart every time you stand, POTS is worth investigating.
Fainting that occurs alongside chest pain, confusion, or shortness of breath is a red flag that warrants prompt evaluation. The same applies if you’re passing out repeatedly, fainting during exercise, or losing consciousness without any warning symptoms beforehand. These patterns can signal cardiac problems that need separate workup beyond blood pressure management.