Neurogenic orthostatic hypotension (nOH) is a drop in blood pressure when you stand up, caused by damage to the nerves that normally keep blood pressure stable. It’s diagnosed when systolic blood pressure falls by at least 20 mmHg or diastolic pressure falls by at least 10 mmHg upon standing. What makes it “neurogenic” is that the nervous system itself is the problem, not dehydration, blood loss, or medication side effects.
How Your Nervous System Normally Controls Blood Pressure
Every time you stand, gravity pulls about a liter of blood toward your legs. In a healthy body, pressure sensors in your blood vessels (called baroreceptors) detect this shift within seconds and trigger the sympathetic nervous system to respond. The nerve endings release norepinephrine, a chemical messenger that tightens blood vessels and speeds up your heart rate, pushing blood back toward your brain and vital organs. This all happens automatically, without you noticing.
In nOH, the nerves responsible for this process are damaged or degenerating. They can’t release enough norepinephrine when you stand. Normally, norepinephrine levels in the blood roughly double within five minutes of standing. In people with nOH, that increase is less than 60%. The result: blood pools in the lower body, pressure drops, and not enough blood reaches the brain.
What It Feels Like
The most recognizable symptom is lightheadedness or dizziness when you stand, sometimes progressing to near-blackout or full fainting. But nOH produces a wider range of symptoms than many people expect. Blurred vision, generalized weakness, fatigue, and difficulty concentrating are all common, especially after prolonged standing or in hot environments.
One distinctive symptom is “coat-hanger pain,” an aching discomfort across the back of the neck and shoulders, shaped roughly like a clothes hanger. In one study, 59% of patients with orthostatic hypotension reported this pain during daily activities. It typically starts within a few minutes of standing or after sitting for 10 minutes to two hours, and it resolves within 5 to 20 minutes of lying down. The pain is thought to result from reduced blood flow to the muscles in that region.
Blood pressure also tends to drop after meals. This postprandial hypotension can develop anywhere from 15 minutes to two hours after eating, because digestion diverts blood toward the gut. For people whose nervous system can’t compensate, this creates a second window of vulnerability beyond just standing up.
How nOH Differs From Other Causes of Low Blood Pressure
Orthostatic hypotension has many possible causes, including dehydration, anemia, and certain medications. The key clinical clue that distinguishes the neurogenic form is the heart rate response. When someone without nerve damage experiences a blood pressure drop, their heart compensates by beating faster, typically increasing by at least 15 beats per minute within three minutes of standing.
In nOH, that heart rate increase is blunted, usually staying below 15 beats per minute. A more precise measure uses the ratio of heart rate change to blood pressure change: a ratio below 0.5 beats per minute per mmHg of systolic pressure drop points toward a neurogenic cause. This blunted response reflects the same underlying nerve damage that prevents blood vessels from tightening properly.
Conditions That Cause nOH
nOH is not a disease on its own. It’s a consequence of nerve damage from an underlying condition. The most common culprits are neurodegenerative diseases that affect the autonomic nervous system, the part of your nervous system that controls involuntary functions like blood pressure, heart rate, and digestion.
Parkinson’s disease is the most widely studied. A large meta-analysis of over 10,000 Parkinson’s patients found that 33% had orthostatic hypotension, and the specifically neurogenic form affected about 26%. Prevalence was higher in men (24%) than women (12%), and patient age was the strongest predictor, more so than disease duration or medication dose.
Other neurodegenerative conditions linked to nOH include multiple system atrophy, Lewy body dementia, and pure autonomic failure. Peripheral nerve damage from diabetes or chemotherapy can also cause it. In all these cases, the common thread is that the nerves controlling blood vessel tone are progressively lost or impaired.
The Problem of Supine Hypertension
One of the trickiest aspects of nOH is that many patients also develop high blood pressure when lying down. This is called supine hypertension, and it creates a frustrating paradox: blood pressure is too low when upright and too high when flat. The same nerve damage that prevents blood vessels from tightening during standing also prevents them from relaxing appropriately when lying down.
Supine hypertension is often silent, meaning patients don’t feel symptoms from it. But over time it carries real risks. It has been linked to thickening of the heart’s left ventricle, increased stroke risk, kidney impairment, and higher rates of organ damage and premature death. Because the elevated pressure occurs mainly at night during sleep, it can go undetected unless blood pressure is specifically measured while lying down.
Daily Management Strategies
Lifestyle adjustments are the foundation of managing nOH, and they can make a meaningful difference on their own. Increasing water and salt intake helps expand blood volume, giving the cardiovascular system more fluid to work with. Drinking about 480 mL (roughly two cups) of water quickly, within five minutes, can raise blood pressure in the short term, making it a useful strategy before standing or before activities that require prolonged upright posture.
Physical countermaneuvers help in the moment. Crossing your legs while standing, squatting, or tensing your abdominal and leg muscles all push blood back toward the heart. These are simple techniques you can use anywhere. Other practical adjustments include eating smaller, more frequent meals to reduce postprandial drops, avoiding alcohol, and being cautious with hot showers or baths, which dilate blood vessels and worsen symptoms.
For nighttime supine hypertension, sleeping with the head of the bed elevated 6 to 9 inches (roughly 30 degrees) helps reduce blood pressure while lying down. Some patients need to sleep in a near-seated position, such as in a recliner, if supine hypertension persists. This elevation also helps reduce overnight fluid shifts that can worsen morning symptoms.
Medication Options
When lifestyle changes aren’t enough, medications can help raise standing blood pressure. The FDA approved droxidopa in 2014 specifically for symptomatic nOH. It works as a building block that your body converts into norepinephrine, essentially replacing the chemical messenger that damaged nerves can no longer produce in adequate amounts.
However, because people with nOH have impaired baroreflexes, they respond to blood pressure medications more dramatically than healthy individuals. This means both treatments that raise blood pressure and those that lower it must be used carefully, since the body has lost its ability to buffer these effects. A dose that would cause a modest change in someone with intact nerves can produce a much larger swing in someone with nOH.
This heightened sensitivity is also why managing the coexistence of standing hypotension and lying-down hypertension is so challenging. Raising daytime blood pressure enough to prevent fainting while avoiding dangerously high nighttime blood pressure requires careful balancing, often through a combination of timed medications, meal planning, and sleeping position adjustments.