Dizziness and Black Spots When Standing Up: Orthostatic Hypotension Explained

What Happens

Rapid standing → blood pools in legs → venous return drops → cardiac output falls → transient cerebral hypoperfusion.

Symptoms

• Visual blackout: Reduced occipital lobe perfusion.
• Dizziness/lightheadedness: Global cerebral hypoperfusion.
• Unsteadiness: May need support to prevent falls.

Reducing Risk

• Hydrate well.
• Stand slowly (sit on edge of bed first).
• Use assistive device if needed.
• Avoid prolonged standing; move legs periodically.

When to See a Doctor

Frequent episodes, especially with cardiovascular risk factors (hypertension, diabetes, high cholesterol), warrant evaluation for autonomic dysfunction, medication side effects, or volume depletion.