1. Balance Disorders Slideshow
2. Take the Vertigo Quiz
3. Tinnitus Slideshow: Why Are My Ears Ringing?

Medical Author:

Benjamin Wedro, MD, FACEP, FAAEM

Benjamin Wedro, MD, FACEP, FAAEM

Dr. Ben Wedro practices emergency medicine at Gundersen Clinic, a regional trauma center in La Crosse, Wisconsin. His background includes undergraduate and medical studies at the University of Alberta, a Family Practice internship at Queen's University in Kingston, Ontario and residency training in Emergency Medicine at the University of Oklahoma Health Sciences Center.

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Medical Editor:

Melissa Conrad Stöppler, MD

Melissa Conrad Stöppler, MD

Melissa Conrad Stöppler, MD, is a U.S. board-certified Anatomic Pathologist with subspecialty training in the fields of Experimental and Molecular Pathology. Dr. Stöppler's educational background includes a BA with Highest Distinction from the University of Virginia and an MD from the University of North Carolina. She completed residency training in Anatomic Pathology at Georgetown University followed by subspecialty fellowship training in molecular diagnostics and experimental pathology.

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In this Article

• Introduction to dizziness (feeling dizzy)
• What are some common causes of dizziness?
• Low blood pressure
• Postural or orthostatic hypotension
• High blood pressure
• Diabetes
• Endocrine diseases
• Hyperventilation
• Heart conditions
• Vasovagal syncope
• Dizziness and vertigo
• What are the symptoms experienced when a person feels dizzy?
• When should I call the doctor for dizziness?
• How is dizziness diagnosed?
• How is dizziness/vertigo diagnosed?
• How is dizziness treated?
• Dizziness At A Glance
• Patient Comments: Dizziness - Diagnosis
• Patient Comments: Dizziness - Causes
• Patient Comments: Dizziness - Standing Up
• Patient Comments: Dizziness - Treatment
• Dizziness (Dizzy) Index

• Diabetes (discussed previously) if not well controlled is one of the main endocrine diseases that may cause dizziness.
  
  
• Thyroid disease: Abnormalities of the thyroid may also cause dizziness as one of its symptoms.
  
  
  • Hyperthyroidism (too much thyroid hormone) may cause palpitations, shortness of breath, lightheadedness, and dizziness.
    
    
  • Hypothyroidism (too little thyroid hormone) may cause low blood pressure and a decreased heart rate leading to dizziness, weakness, lethargy, and chills.
  
  
  
• Addison's disease: Addison's disease occurs when the adrenal glands do not produce enough cortisol to meet the needs of the body. Cortisol is a naturally occurring steroid produced by the body and is part of the stress response (often termed the "fight or flight" response). If cortisol levels are low, a patient may experience weakness, fatigue, dizziness, lightheadedness, low blood sugar, and low blood pressure.

While the body may use hyperventilation or rapid breathing to help with acid-base balance, it may also occur as a response to an emotionally stressful situation. In hyperventilation syndrome, the rapid breathing blows off some of the body's carbon dioxide, leading to a tingling sensation in the hands and feet, and around the mouth. Dizziness and lightheadedness are associated symptoms. The symptoms may increase the perceived emotional stress and cause even more hyperventilation. In severe hyperventilation, carbon monoxide levels drop enough to cause carpopedal spasm, in which the hands and feet become claw-like and difficult to move. Symptoms of hyperventilation resolve relatively quickly once the breathing rate returns to normal.