🧍‍♂️ Orthostatic Hypotension (Postural Hypotension): Dizzy When You Stand Up?

You stand up from a chair or get out of bed in the morning, and suddenly the world spins, your vision goes grey, and you feel like you’re about to faint. This classic experience is called orthostatic hypotension (also known as postural hypotension). It is the most common form of symptomatic low blood pressure, especially in older adults, but it can affect people of any age. Dr. Ravi Sishir Reddy explains exactly what it is, why it happens, and — most importantly — how to manage it.

1. What Is Orthostatic Hypotension?

Orthostatic hypotension is defined as a significant drop in blood pressure within three minutes of standing up. The formal diagnostic criteria are:

• A decrease in systolic blood pressure of at least 20 mmHg, OR
• A decrease in diastolic blood pressure of at least 10 mmHg.

In some people with supine hypertension (high BP when lying down), a drop of ≥15 mmHg in diastolic may be used.

This is not a disease itself but a manifestation of an underlying problem — often involving the autonomic nervous system, blood volume, or medications.

2. Why Does Standing Up Drop Blood Pressure?

When you stand, gravity pulls about 300–800 ml of blood down into your legs and abdominal veins. A healthy body instantly compensates through a reflex arc:

• Baroreceptors in the carotid arteries and aorta sense the drop in pressure.
• Sympathetic nervous system is activated — heart rate increases, and blood vessels constrict.
• Venous return is maintained, and cardiac output stays stable.

In orthostatic hypotension, one or more parts of this reflex fail. The result: not enough blood reaches the brain, and symptoms occur.

3. What Causes Orthostatic Hypotension?

The causes are broadly divided into acute and chronic:

Acute (Reversible) Causes

• Dehydration — from vomiting, diarrhoea, fever, or inadequate fluid intake.
• Blood loss — acute haemorrhage from injury or gastrointestinal bleeding.
• Prolonged bed rest — deconditions autonomic reflexes.
• Medications — particularly alpha‑blockers, diuretics, nitrates, and some antidepressants.

Chronic (Often Irreversible) Causes

• Autonomic neuropathy: Diabetes, Parkinson’s disease, multiple system atrophy (MSA), pure autonomic failure.
• Ageing: Baroreflex sensitivity declines with age; combined with arterial stiffness, elderly individuals are highly susceptible.
• Chronic venous insufficiency: Blood pools in the legs due to weak vein valves.
• Adrenal insufficiency: Low aldosterone reduces sodium and water retention.

👉 Read more: Causes of Low Blood Pressure →

4. Symptoms: What Does Orthostatic Hypotension Feel Like?

Symptoms typically occur within seconds to a minute or two of standing and are relieved by sitting or lying down.

• Lightheadedness or dizziness.
• Blurred, dimmed, or tunnel vision.
• Weakness or heaviness in the legs.
• Nausea.
• Coat‑hanger pain — aching in the back of the neck and shoulders, due to reduced blood flow to the muscles of that region.
• Syncope (fainting) — if the drop is severe and sustained.

Dr. Reddy highlights that many elderly patients do not report dizziness but may simply complain of fatigue, difficulty thinking, or leg weakness after standing.

5. How Is Orthostatic Hypotension Diagnosed?

Diagnosis is clinical. Your doctor will measure your blood pressure while you are lying down, then again at 1 minute and 3 minutes after you stand up. A drop meeting the criteria confirms the diagnosis.

Further tests may include:

• Tilt‑table test: If the diagnosis is unclear or if delayed orthostatic hypotension is suspected.
• Blood tests: For anaemia, electrolyte imbalance, adrenal function, and vitamin deficiencies.
• ECG and echocardiogram: To rule out structural heart disease.
• Autonomic function tests: In suspected autonomic neuropathy.

6. How to Manage and Treat Orthostatic Hypotension

Treatment is stepwise, starting with non‑pharmacological measures:

Lifestyle and Physical Counter‑Manoeuvres

• Stand up slowly: Especially from bed in the morning. Sit on the edge of the bed for a minute before standing.
• Avoid sudden postural changes: Rise gradually from squatting or bending.
• Stay hydrated: Drink 2–3 litres of water daily, unless fluid‑restricted.
• Increase salt intake: Only under a doctor’s guidance and if not contraindicated (heart failure, kidney disease, hypertension when supine).
• Eat small, low‑carb meals: Large carbohydrate‑heavy meals can worsen postprandial and orthostatic hypotension.
• Physical counter‑manoeuvres: Cross your legs and tense your muscles, squat briefly, or march in place if you feel faint while standing.
• Compression stockings: Waist‑high compression stockings reduce venous pooling in the legs.
• Elevate the head of the bed: Sleeping with the head of the bed raised 10–20 cm reduces supine hypertension and morning orthostatic drops.

👉 Read more: How to Raise Low Blood Pressure →

Medications

If symptoms persist despite these measures, medications may be prescribed:

• Fludrocortisone: A mineralocorticoid that increases sodium and water retention, expanding blood volume.
• Midodrine: A vasoconstrictor that tightens blood vessels and raises BP. Must be taken during the day (not within 4 hours of lying down).
• Droxidopa: Used for neurogenic orthostatic hypotension.

👉 Read more: Midodrine for Orthostatic Hypotension →

7. Special Considerations for the Elderly

Orthostatic hypotension affects up to 20% of people over 65 and is a major cause of falls and fractures. In this group, the priority is safety. Dr. Reddy advises:

• Remove loose rugs and install grab bars in the bathroom.
• Ensure adequate lighting for nighttime bathroom trips.
• Review medications carefully — many elderly patients are on alpha‑blockers for prostate or diuretics that can be reduced.
• Treating supine hypertension while managing orthostatic hypotension is a delicate balancing act; individualised targets are essential.

👉 Read more: Low BP in the Elderly & Fall Risk →