Causes
Orthostatic hypotension has many causes, and more than one is often present:- Dehydration: Too little fluid in the bloodstream from inadequate intake, illness, or diuretics. Florida's year-round heat makes dehydration a particularly common trigger for our patients.
- Medications: Blood pressure medicines, water pills, prostate medications such as alpha-blockers, some antidepressants, and drugs for Parkinson's disease are frequent culprits.
- Meals and alcohol: Blood is diverted to the digestive tract after eating, and alcohol relaxes blood vessels. Both can lower standing blood pressure, particularly in older adults after a large, carbohydrate-heavy meal.
- Nerve disorders: Conditions that damage the autonomic nerves controlling blood vessels, including diabetic neuropathy from long-standing diabetes and Parkinson's disease.
- Anemia or blood loss: Fewer red blood cells or less blood volume means less pressure to spare; see anemia.
- Heart problems and deconditioning: A weakened heart, prolonged bed rest, and normal aging all blunt the standing reflex.
Symptoms
Symptoms appear within seconds to minutes of standing and improve with sitting or lying down:- Dizziness or lightheadedness: The hallmark symptom, often worst first thing in the morning, after meals, or in hot weather.
- Blurred or dimming vision: A "graying out" sensation as brain blood flow dips.
- Weakness, fatigue, or brain fog: Some people feel unsteady or mentally foggy rather than dizzy.
- Aching across the neck and shoulders: Sometimes called "coat-hanger" pain, this comes from reduced blood flow to the neck and shoulder muscles while upright and typically eases within moments of sitting down.
- Fainting: The most serious consequence, because of the injuries a fall can cause.
Diagnosis
The key test is simple: blood pressure and heart rate measured lying down and then after one and three minutes of standing. Your physician will also review every medication and supplement you take, examine you for signs of dehydration or nerve disease, and order blood tests such as a blood count, kidney function, and glucose. An electrocardiogram screens for heart rhythm problems that can mimic or worsen the condition. Because readings change through the day, you may be asked to keep a home log of blood pressures and symptoms — including readings taken first thing in the morning and about half an hour after meals, when the drop is often largest.Treatment
Treatment starts with practical measures and medication adjustments:- Review of medications: Lowering doses, changing timing, or substituting different drugs is often the single most effective step.
- Fluids and salt: Drinking water consistently through the day — and, when your physician approves, liberalizing salt — expands blood volume.
- Behavioral strategies: Rise in stages from lying to sitting to standing, tense the leg muscles before standing, and avoid prolonged standing in heat.
- Compression garments: Waist-high compression stockings or abdominal binders reduce blood pooling in the legs.
- Meal and sleep adjustments: Smaller, more frequent meals with less refined carbohydrate limit post-meal drops, and raising the head of the bed a few inches at night reduces morning symptoms for some patients.
- Prescription options: When symptoms persist, medications such as midodrine or fludrocortisone may be used in carefully selected patients.
Complications
The chief risk is injury from a fall, which in an older adult can mean a hip or wrist fracture — a particular concern for anyone whose bones are already thinned by osteoporosis. Repeated episodes also lead many people to limit walking and activity, and that deconditioning weakens the standing reflex further, creating a cycle worth interrupting early.When to Seek Immediate Care
Seek urgent care for fainting that causes injury, chest pain, black or bloody stools (a sign of internal bleeding), or dizziness that does not improve with lying down. Orthostatic hypotension is very manageable once its causes are identified, and treating it meaningfully reduces fall risk. Zimmer Medical Group's St. Petersburg primary care team routinely checks orthostatic vital signs for patients with dizziness and tailors a step-by-step plan.Making an Orthostatic Hypotension Plan Work
Orthostatic hypotension responds better to daily habits than to any prescription, and those habits only work when practiced at the moments the pressure drops: getting out of bed, standing after a meal, standing in the heat.
The maneuvers that buy you thirty seconds
Before standing, sit on the edge of the bed for a minute and pump the ankles. If dizziness starts once upright, cross the legs and squeeze the thighs, tense the buttocks, or bend forward as if tying a shoe; these push blood toward the chest within seconds. Getting up at night is the highest-risk moment, so keep a night light on the way to the bathroom. Our fall prevention guide covers the home setup.
Which medications get adjusted first
Diuretics such as furosemide and hydrochlorothiazide and the alpha-blockers for prostate enlargement — tamsulosin, terazosin, doxazosin — are the usual first targets, and moving the alpha-blocker to bedtime often solves it. Trazodone, older antidepressants, and nitrates add to the drop. Treatment of high blood pressure is rebalanced rather than abandoned, because lying-down pressure often stays high in the same person; our polypharmacy article explains the review.
Fluid, salt, and the Florida factor
Heat widens blood vessels and sweating drains volume, so symptoms are worse in a Tampa Bay summer, in a hot shower, and after yard work. Two glasses of cool water fifteen minutes before standing for a long stretch raise pressure for about an hour. Alcohol worsens it the same evening. Liberalizing salt helps some people but is unsafe in heart failure or advanced chronic kidney disease. See our hydration and heat safety guides.
When a prescription is added
Midodrine tightens blood vessels for a few hours and is taken during the waking day, the last dose several hours before lying down so it does not push supine pressure up overnight. Fludrocortisone expands blood volume instead, and needs potassium and ankle swelling watched. Both come after the medication review, and both need home lying and standing readings.
What it is confused with
A racing pulse rather than a falling pressure on standing suggests postural tachycardia; see our POTS article. Fainting with nausea, sweating, and a warning aura is usually vasovagal syncope; see our fainting guide. Spinning triggered by rolling over in bed is vertigo, not low pressure, and often fixable in one visit — see the Epley maneuver article. Anemia is checked in anyone newly dizzy on standing. Our cardiovascular team measures orthostatic vital signs properly. MedlinePlus and NINDS publish patient guidance on orthostatic hypotension.
If you feel gray or unsteady every time you stand, schedule a visit and bring a week of readings.