What causes dizziness?

Some common causes of dizziness include hunger, fatigue, hypoglycemia (low blood sugar), or anxiety. Dizziness can also be caused by neurologic conditions, such as multiple sclerosis, Parkinson’s disease, and epilepsy. Vertigo (the perception of moving or your surroundings moving around you) is associated with disturbances in the vestibular system, which governs balance. Because your ears are associated with this system, ear infections and diseases, such as Meniere’s disease, can affect your sense of balance and gait. Benign positional vertigo affects the inner ear and occurs when you change the position of your head. Labyrinthitis usually follows a cold or flu and is often caused by a viral infection of the inner ear.

Serious causes of dizziness can include heart attack, stroke, or shock, all of which are severe, potentially life-threatening conditions that warrant immediate medical care.

Causes of lightheadedness

Dizziness in the sense of lightheadedness may be caused by the following:

  • Alcohol or drug use or intoxication
  • Allergic reactions
  • Anxiety or panic
  • Arrhythmias (irregular heartbeats)
  • Hypoglycemia (low blood sugar)
  • Infections or illnesses such as the cold or flu
  • Medication side effects
  • Mild dehydration

Causes of vertigo

Vertigo may be caused by the following:

  • Alcohol or drug use or intoxication
  • Labyrinthitis (inner ear infection)
  • Medication side effects
  • Meniere’s disease (inner ear condition affecting balance and hearing)
  • Positional vertigo (dizziness that occurs when shifting the position of the head)

Neurologic causes of dizziness

Dizziness can also be caused by neurologic conditions including:

  • Brain hemorrhage
  • Brain tumor
  • Migraine
  • Multiple sclerosis
  • Parkinson’s disease

Serious or life-threatening causes of dizziness

In some cases, dizziness may be a symptom of a serious or life-threatening condition that should be immediately evaluated in an emergency setting. These include:

  • Brain hemorrhage
  • Myocardial infarction (heart attack)
  • Severe bleeding
  • Shock
  • Stroke
  • Transient ischemic attack (temporary stroke-like symptoms that may be a warning sign of an impending stroke)

Questions for diagnosing the cause of dizziness

To diagnose your condition, your doctor or licensed health care practitioner will ask you several questions related to your dizziness including:

  • How long have you been experiencing dizziness?
  • Is your dizziness caused by changing positions?
  • Do you have other symptoms in addition to dizziness?
  • Did the dizziness occur with or following an illness?
  • Does the dizziness stop in certain situations? Does anything remedy the dizziness?
  • Have you ever fainted or passed out as a result of your dizziness?
  • Are you stressed or anxious?

What are the potential complications of dizziness?

Because dizziness can be due to serious diseases, failure to seek treatment can result in serious complications and permanent damage. Once the underlying cause is diagnosed, it is important for you to follow the treatment plan that you and your health care professional design specifically for you to reduce the risk of potential complications including:

  • Brain damage
  • Heart failure
  • Loss of hearing
  • Loss of vision
  • Paralysis
  • Spread of cancer
  • Spread of infection


Dizziness. Medline Plus, a service of the National Library of Medicine National Institutes of Health. http://www.nlm.nih.gov/medlineplus/ency/article/003093.htm. Accessed May 25, 2011.

Balance disorders. National Institute on Deafness and Other Communication Disorders. http://www.nidcd.nih.gov/health/balance/balance_disorders.html. Accessed May 25, 2011.


What is dizziness?

Dizziness is the sensation of lightheadedness, or the feeling that you might pass out. Dizziness may be accompanied by nausea and vomiting, perspiration or a cold sweat, and fainting. Blood supplies oxygen to the brain. Dizziness occurs when blood is not getting to the brain quickly enough, or if there is a deficit in the amount of oxygen in the blood.... Read more about dizzinessintroduction


What other symptoms might occur with dizziness?

Dizziness may accompany other symptoms, which vary depending on the underlying disease, disorder, or condition.... Read more about dizzinesssymptoms

Medical Reviewer: All content has been reviewed by board-certified physicians under the direction of Rich Klasco, M.D., FACEP. Last Annual Review Date: May 2, 2011 Copyright: © Copyright 2011 Health Grades, Inc. All rights reserved. May not be reproduced or reprinted without permission from Health Grades, Inc. Use of this information is governed by the HealthGrades User Agreement.

This Article is Filed Under: Brain and Nerves