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PubMed This is a summary of 27 peer-reviewed journal articles Updated
Neurology · Neurogenic Orthostatic Hypotension

What Causes Dizziness in Parkinson's Disease?

At a Glance

Dizziness in Parkinson's disease is often caused by neurogenic orthostatic hypotension (nOH), a sharp drop in blood pressure upon standing. This happens when nerve damage prevents blood vessels from tightening. Treatments include hydration, diet changes, abdominal binders, and medication adjustments.

In this answer

4 sections

01

The Mechanism: Why nOH Happens

02

Common Triggers: Meals and Medications

03

Protecting the Brain and Preventing Falls

04

Practical Management Strategies

Feeling dizzy, lightheaded, or faint when you stand up is a common and highly disruptive symptom of Parkinson’s disease. While many people mistake this dizziness for a normal part of aging, it is often a direct result of the disease itself, caused by a condition called neurogenic Orthostatic Hypotension (nOH) [1]. However, it is also important to know that Parkinson’s medications—such as levodopa—can frequently lower your blood pressure and significantly worsen these symptoms [2].

The Mechanism: Why nOH Happens

To understand nOH, it helps to look at how the body normally responds to standing. When a healthy person stands up, gravity pulls blood down into their legs and belly. The autonomic nervous system—the part of your brain and nerves that controls automatic functions like heart rate and digestion—instantly senses this drop in blood pressure. It responds by releasing a chemical messenger called norepinephrine, which tells blood vessels to constrict (tighten) and push blood back up to the heart and brain [3][1].

In Parkinson’s disease, the abnormal protein alpha-synuclein builds up in the nerves of the autonomic nervous system [4][5]. This buildup damages the nerve endings that connect to your heart and blood vessels [6]. Because these damaged nerves cannot release enough norepinephrine, your blood vessels do not tighten as they should when you stand [1][3]. Blood pools in your lower body, causing a sharp drop in blood pressure. This deprives the brain of oxygen-rich blood, causing you to feel dizzy or lightheaded [7][8].

Common Triggers: Meals and Medications

Many patients notice that their dizziness is unpredictable. Two major factors can trigger or worsen your symptoms:

  • Eating Meals: Digestion requires a significant amount of blood flow to the stomach and intestines. In Parkinson’s disease, this can cause a sharp drop in blood pressure after eating, known as postprandial hypotension [9][10]. Meals that are large or high in carbohydrates are especially likely to trigger this sudden dizziness [11][10].
  • Parkinson’s Medications: Drugs like levodopa are essential for managing your motor symptoms, but they can also cause a decrease in your overall blood pressure [2]. A thorough medication review with your doctor can help you safely manage your dosage timing.

Protecting the Brain and Preventing Falls

Dizziness from nOH is a major safety concern. Patients with nOH have significantly higher rates of falls, which can lead to serious injuries [12][13]. Furthermore, repeated episodes of low blood flow to the brain can contribute to cognitive decline over time [14][15]. Effectively managing your blood pressure is not just about stopping the dizziness—it is a critical step in protecting your brain health and preserving your memory [14].

Practical Management Strategies

Managing nOH usually starts with lifestyle adjustments before considering prescription medications [16][17].

  • Adjust Your Diet: Eating smaller, more frequent meals that are lower in carbohydrates can help prevent blood pressure drops after eating [18][19].
  • Hydration and Salt: Drinking plenty of fluids increases your total blood volume [8]. If safe for your heart and kidneys, your doctor may also recommend increasing your salt intake [20].
  • Physical Counter-Maneuvers: When you feel dizzy, immediately tensing your leg muscles, crossing your legs, or squatting can help push blood from your lower body back up to your brain [21]. Always take your time and change positions slowly.
  • Compression Garments: Wearing an abdominal binder (a wide, tight elastic belt worn around the waist) physically prevents blood from pooling in your belly. Binders are often more effective and easier to put on than thigh-high compression stockings [22][23].
  • Elevate the Head of Your Bed: Raising the head of your bed by 10 to 30 degrees helps condition your body overnight and reduces nighttime fluid loss [22].

When Lifestyle Changes Are Not Enough

If non-drug strategies do not control your symptoms, your doctor may prescribe medications specifically designed to treat nOH, such as droxidopa, fludrocortisone, or midodrine [24][25].

A Critical Warning: Supine Hypertension

A major challenge in treating nOH is that therapies used to raise your standing blood pressure can sometimes cause your blood pressure to go dangerously high when you lie flat—a condition called supine hypertension [26][27]. You will need to work with your doctor to monitor your blood pressure in different positions to balance this risk safely.

When to Call Your Doctor

You should contact your healthcare provider immediately if your dizziness prevents you from safely performing daily activities, or if you actually lose consciousness or faint (syncope) [12][9].

Common questions in this guide

Why do I feel dizzy or lightheaded when standing up with Parkinson's?
Dizziness upon standing is often caused by neurogenic orthostatic hypotension. In Parkinson's, nerve damage prevents your blood vessels from tightening normally, causing blood to pool in your legs and depriving your brain of oxygen.
Can my Parkinson's medications make my dizziness worse?
Yes, essential Parkinson's medications like levodopa can lower your overall blood pressure and significantly worsen dizziness. Your doctor may need to adjust your dosage timing to help manage this side effect safely.
Why does eating make my dizziness worse?
Digestion pulls a significant amount of blood to your stomach and intestines. Large or high-carbohydrate meals can cause a sudden drop in blood pressure, leading to dizziness shortly after eating.
How can I prevent blood from pooling in my legs when standing?
Wearing a tight elastic abdominal binder around your waist physically prevents blood from pooling. You can also try tensing your leg muscles, crossing your legs, or squatting when you feel dizzy to push blood back up to your brain.
What is supine hypertension and why is it a concern?
Supine hypertension is a dangerous increase in blood pressure that happens when you lie flat. It is a major risk when taking medications or using therapies designed to raise your standing blood pressure, requiring careful monitoring by your doctor.

Questions to Ask Your Doctor

Curated prompts to bring to your next appointment.

  1. 1.Are my current Parkinson's medications, like levodopa, lowering my blood pressure, and can we adjust my dosage or timing to help?
  2. 2.What specific blood pressure readings should I be aiming for when standing versus when lying down?
  3. 3.How exactly should I safely measure my blood pressure at home to check for supine hypertension?
  4. 4.Would I be a good candidate for prescription medications designed to treat nOH, such as droxidopa or midodrine?
  5. 5.Should I schedule an appointment with a cardiologist or autonomic specialist to help manage these blood pressure swings?

Questions For You

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References

References (27)
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This page explains the causes of dizziness in Parkinson's disease for educational purposes only. Always consult your neurologist before adjusting your medications, diet, or fluid intake.

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