Orthostatic hypotension is a drop in blood pressure that happens when you stand up. It’s diagnosed when your systolic blood pressure (the top number) falls by at least 20 mmHg, or your diastolic (bottom number) falls by at least 10 mmHg, within three minutes of standing. About one in five adults over 65 experience it, and symptoms range from brief lightheadedness to fainting.
Why Standing Up Drops Your Blood Pressure
When you go from lying down to standing, gravity pulls roughly 300 to 800 mL of blood downward into your legs and abdomen. Your body has a built-in correction system: pressure sensors in your neck arteries and aorta detect the sudden drop and fire signals to your brain. Within seconds, your nervous system responds by tightening blood vessels and speeding up your heart rate, pushing blood pressure back to normal.
Orthostatic hypotension happens when that correction system can’t keep up. The sensors may be working fine, but the body can’t respond fast enough or strongly enough, whether because there isn’t enough blood volume to work with, the blood vessels can’t tighten properly, or the nerves controlling the process are damaged.
Neurogenic vs. Non-Neurogenic Causes
The distinction matters because it points to very different underlying problems. Neurogenic orthostatic hypotension results from damage to the nerves that control blood vessel tightening. The nervous system simply can’t release enough of the chemical signals needed to constrict vessels when you stand. This form shows up in conditions like Parkinson’s disease, multiple system atrophy, and diabetes-related nerve damage. One telltale sign: your heart rate barely increases when you stand. A rise of less than 15 beats per minute after standing suggests the neurogenic form.
Non-neurogenic orthostatic hypotension means the nervous system is intact, but something else is interfering. Dehydration, blood loss, heart valve problems, or medications can all reduce the amount of blood available or weaken the heart’s pumping ability. In these cases, your heart rate typically jumps noticeably as it tries to compensate.
Medications That Commonly Trigger It
Medications are one of the most frequent causes, and the list extends well beyond blood pressure drugs. The major culprits include:
- Diuretics (water pills), which deplete fluid volume
- Alpha-blockers, often prescribed for prostate enlargement or high blood pressure, which directly prevent blood vessels from tightening
- Beta-blockers, which slow the heart and blunt the compensatory increase in heart rate
- Nitrates, used for chest pain, which widen veins and reduce blood returning to the heart
- Tricyclic antidepressants like amitriptyline, which block the receptors involved in vessel constriction
- SSRIs and SNRIs, common antidepressants that can impair blood pressure regulation on standing
- Antipsychotics, particularly clozapine and quetiapine
- Benzodiazepines, which reduce muscle tone and sympathetic nervous system activity
- Opioids and Parkinson’s medications (levodopa), both of which cause blood vessel relaxation
If you take any of these and notice dizziness when standing, that connection is worth raising with whoever prescribes them. In many cases, adjusting the dose or timing resolves the problem.
What It Feels Like
The hallmark symptom is dizziness or lightheadedness within moments of standing up. Some people faint. But the full range of symptoms is broader than most people expect: blurred vision, nausea, feeling suddenly hot or sweaty, heart palpitations, headache, confusion, weakness, and even chest, shoulder, or neck pain. Symptoms tend to be worse in the morning, when blood pressure is naturally lower and you’ve been lying flat all night.
Some people with orthostatic hypotension have no symptoms at all. Their blood pressure drops measurably, but they don’t feel it. This “silent” form still carries health risks. A 2025 guideline from the American Heart Association notes that orthostatic hypotension is predictive of cardiovascular events, which is why screening before starting blood pressure medications is now recommended.
How It’s Diagnosed
The simplest test is the active stand test. You lie down for at least five minutes while your blood pressure is measured, then stand up. Blood pressure and heart rate are checked at one, three, five, and ten minutes after standing. If your blood pressure drops past the threshold within three minutes, the diagnosis is confirmed.
A tilt table test is used when more detailed information is needed, or when someone faints too easily to stand safely. You lie strapped to a motorized table that tilts you to a 60-degree angle while instruments continuously track your blood pressure, heart rate, and heart rhythm. The test typically lasts up to 30 minutes. The heart rate response during either test helps distinguish neurogenic from non-neurogenic causes.
Lifestyle Strategies That Help
Non-drug approaches are the first line of management, and for many people they’re enough. Fluid intake is critical: aim for 1.25 to 2.5 liters of water per day (roughly five to eight glasses). Salt intake should also increase, often to 10 to 20 grams per day, which is significantly more than what’s typically recommended for the general population. This helps your body hold onto fluid and maintain blood volume. Your doctor will guide the right amount based on your heart and kidney health.
Physical counter-maneuvers can rescue you in the moment when you feel symptoms coming on. These work by squeezing blood out of the veins in your legs and back toward your heart. Hold each for about 30 seconds:
- Crossing your legs and squeezing your thigh muscles together
- Rising onto your toes repeatedly
- Bending forward at the waist
- Marching slowly in place
- Tensing both thighs simultaneously while standing
Other practical habits make a difference: sit on the edge of the bed for a minute before standing in the morning, avoid prolonged standing in hot environments, eat smaller meals (large meals divert blood to your digestive system), and elevate the head of your bed by four to six inches at night so your body adjusts to a more upright position gradually.
When Medications Are Needed
For people whose symptoms persist despite lifestyle changes, especially those with neurogenic orthostatic hypotension, medications can help. The main options work through different mechanisms. One approach increases blood volume by helping the kidneys retain salt and water. Another raises blood pressure by directly tightening blood vessels and is typically taken before activities that involve prolonged standing. A third option, used primarily in neurogenic cases tied to Parkinson’s disease and similar conditions, works by replenishing the chemical messenger the damaged nerves can no longer produce in sufficient quantities.
These medications are usually started at low doses and adjusted upward based on symptoms. A key challenge with all of them is avoiding high blood pressure while lying down, since the same drugs that raise standing blood pressure can push it too high at rest. This is why the head-of-bed elevation strategy remains important even when medications are added.
Who’s Most at Risk
Age is the strongest risk factor. A meta-analysis covering nearly 25,000 older adults found that 22% of community-dwelling older people have orthostatic hypotension, rising to almost 24% in long-term care settings. The 2025 AHA guidelines estimate that 7% to 10% of all adults with high blood pressure are affected. People with diabetes, Parkinson’s disease, or other conditions involving nerve damage face especially high rates.
Interestingly, treating high blood pressure does not appear to make orthostatic hypotension worse. A large meta-analysis of over 31,000 participants found that more intensive blood pressure treatment actually lowered the risk of orthostatic hypotension rather than raising it. And among people who already had orthostatic hypotension, aggressive blood pressure treatment still reduced cardiovascular events and mortality without additional harm. This has shifted clinical thinking: orthostatic hypotension is no longer considered a reason to avoid treating high blood pressure.