Orthostatic hypotension is a drop in blood pressure that happens when you stand up. It’s formally defined as a decrease of at least 20 mmHg in systolic pressure (the top number) or 10 mmHg in diastolic pressure (the bottom number) within two to five minutes of standing. That sudden drop reduces blood flow to your brain, which is why it can make you feel dizzy, lightheaded, or even cause you to faint.
The condition is common, especially as you get older. Roughly 10% of adults over 60 and 16% of those over 65 experience it. But it can affect younger people too, depending on medications, hydration, and underlying health conditions.
What Happens in Your Body
When you stand, gravity pulls about 300 to 800 milliliters of blood downward into your legs and abdomen. In a healthy system, your body compensates almost instantly: blood vessels tighten, your heart rate picks up slightly, and blood pressure stays stable. Orthostatic hypotension occurs when that compensation fails or is too slow.
There are three recognized patterns based on how quickly the blood pressure drop occurs. Classic orthostatic hypotension shows up within three minutes of standing. Initial orthostatic hypotension is a very brief dip that happens within 15 seconds, often before a standard blood pressure reading can catch it. Delayed orthostatic hypotension takes longer than three minutes to appear, which means it can be missed during a routine check-up if you’re only standing briefly.
Common Symptoms
The symptoms all trace back to one thing: your brain isn’t getting enough blood in that moment. The most recognizable signs are dizziness, lightheadedness, and blurred vision when you stand. Some people feel a wave of fatigue or confusion. In more severe cases, you may faint, which is the main reason this condition is a leading contributor to falls in older adults.
A less well-known symptom is what’s called “coat hanger pain,” an aching or tightness across the neck and shoulders that follows the shape of a coat hanger. This happens because the muscles in that area aren’t getting adequate blood flow either. Some people also report lower back pain or a general sense of weakness, particularly if the blood pressure stays low for more than a few seconds.
Not everyone with orthostatic hypotension notices symptoms. Some people have measurable drops in blood pressure but feel fine. This doesn’t mean the condition is harmless. Repeated, undetected drops are still associated with a higher risk of falls and cardiovascular problems over time.
What Causes It
The causes fall into two broad categories: things that reduce blood volume, and things that impair your nervous system’s ability to regulate blood pressure.
Medications
Medications are one of the most common triggers. Several drug classes are well-documented culprits:
- Blood pressure medications: Alpha blockers frequently cause severe orthostatic hypotension. Thiazide diuretics (water pills) do the same by reducing fluid volume and potassium levels. Beta blockers and ACE inhibitors can also contribute.
- Antidepressants: Older tricyclic antidepressants and MAOIs are significant offenders. SNRIs commonly cause it as well. SSRIs do so only rarely.
- Antipsychotics: Nearly all medications used for psychosis carry some risk because of how they affect blood vessel tone.
- Parkinson’s medications: Dopamine agonists and MAO-B inhibitors, both commonly prescribed for Parkinson’s disease, can cause or worsen the problem.
If you take any of these medications and notice dizziness when standing, that connection is worth discussing with your prescriber. Often the issue can be managed with a dosage adjustment or a switch to a different drug.
Dehydration and Blood Loss
Anything that reduces the volume of blood circulating in your body makes orthostatic hypotension more likely. Dehydration from not drinking enough water, sweating heavily, vomiting, or diarrhea is a frequent and easily reversible cause. Significant blood loss, whether from surgery, injury, or heavy menstrual periods, does the same thing.
Nervous System Conditions
When the nervous system itself is damaged, the condition is called neurogenic orthostatic hypotension. This form tends to be more persistent and harder to manage. About 40% of people with Parkinson’s disease experience orthostatic hypotension, and in virtually all of those cases, the underlying issue is nerve-related. Other neurological conditions linked to it include multiple system atrophy, Lewy body dementia, and pure autonomic failure.
Peripheral nerve damage from diabetes, alcoholism, amyloidosis, vitamin B12 deficiency, kidney disease, and HIV can also impair the nerves that control blood vessel tightening. Spinal cord injuries, multiple sclerosis, and certain brain stem lesions round out the list of neurogenic causes.
How It’s Diagnosed
The simplest test is one you’ve probably experienced: a doctor checks your blood pressure while you’re lying down, then again after you’ve been standing for a few minutes. If the systolic reading drops by 20 mmHg or more, or the diastolic drops by 10 mmHg or more, you meet the diagnostic criteria.
For cases that are harder to pin down, especially delayed orthostatic hypotension, a tilt table test provides a more controlled environment. You lie on a padded table with straps, and the table is tilted upward to simulate standing while monitors continuously track your blood pressure, heart rate, and heart rhythm. This allows your medical team to see exactly how your cardiovascular system responds to the position change, second by second, without the risk of a fall.
Your doctor may also order blood work to check for dehydration, anemia, or blood sugar issues, along with other tests depending on whether a neurological cause is suspected.
Managing Orthostatic Hypotension
Lifestyle Strategies
For mild cases, simple habit changes are often enough. Increasing your water intake helps maintain blood volume, and adding more salt to your diet (if your doctor agrees it’s safe given your overall cardiovascular health) does the same by helping your body retain fluid. Eating smaller, more frequent meals can reduce the blood pressure dips that sometimes follow large meals.
Physical counter-maneuvers offer immediate, practical help. Crossing your legs while standing, squeezing your thigh muscles before you get up, or clenching your fists can temporarily push blood pressure upward. Rising slowly, sitting on the edge of the bed for a minute before standing in the morning, and avoiding prolonged standing in hot environments are small adjustments that make a real difference.
Compression stockings that cover the legs up to the waist help prevent blood from pooling in the lower body. Waist-high versions work better than knee-high ones because so much blood pools in the abdomen, not just the calves.
Medication Adjustments
If a medication is causing the problem, the first step is usually re-evaluating whether it’s still necessary, or whether a lower dose or alternative drug could work. This is especially relevant for older adults who may be taking multiple blood pressure medications simultaneously.
When lifestyle measures aren’t enough and the condition is significantly affecting quality of life or causing falls, medications that raise blood pressure can be prescribed. These work by either tightening blood vessels or increasing blood volume. They’re generally reserved for more severe or neurogenic cases, because raising blood pressure carries its own risks, particularly high blood pressure while lying down.
Why It Matters Beyond Dizziness
Orthostatic hypotension is more than an inconvenience. Repeated fainting episodes can lead to serious injuries from falls, including hip fractures and head trauma, which are especially dangerous for older adults. The condition is also associated with higher rates of heart disease, stroke, and overall mortality, likely because the same underlying problems (nerve damage, cardiovascular dysfunction, chronic dehydration) that cause it also contribute to those outcomes.
If you’re noticing regular dizziness or unsteadiness when you stand, keeping a log of when it happens, what you’ve eaten and drunk, and what medications you’ve taken can help your doctor identify the cause more quickly. In many cases, the fix is straightforward. In others, identifying orthostatic hypotension is the clue that leads to diagnosing a more significant underlying condition.