Dizziness
A common medical complaint with four main subtypes.
Wikipedia / Wikimedia Commons
Dizziness is a catch-all term describing a sense of disorientation, which can manifest as vertigo, lightheadedness, or a feeling of imbalance. It may also refer to a vague sensation of giddiness or foolishness. This is a frequent health issue, reported by 20–30% of people. Dizziness is categorized into four main types: vertigo (accounting for about 25–50% of cases), disequilibrium (under 15%), presyncope (under 15%), and nonspecific dizziness (around 10%).
Vertigo involves a sensation of spinning, either of oneself or the surroundings, often accompanied by nausea and vomiting. Presyncope describes lightheadedness or a feeling of impending faint, linked to syncope (actual fainting). Disequilibrium is a sense of being off-balance, often leading to falls in a particular direction, and rarely causes nausea or vomiting. Nonspecific dizziness, such as persistent postural-perceptual dizziness, may have psychiatric origins. It is a diagnosis made by excluding other causes and can be triggered by hyperventilation.
**Mechanism and causes** Balance relies on multiple body systems—the inner ear, eyes, muscles, skeleton, and nervous system—so dizziness can stem from various problems. It may indicate a localized issue (affecting balance or coordination) or a widespread one (like toxin exposure or poor blood flow). Common causes include: - Inadequate blood supply to the brain from a sudden blood pressure drop, heart problems, artery blockages, or anemias (e.g., vitamin B12 or iron deficiency). - Loss or distortion of vision or visual cues. - Standing too quickly or prolonged standing. - Vertigo from inner ear disorders. - Dehydration. - Neurological side effects from medications like anticonvulsants and sedatives. - Dysfunction of cervical proprioception. - Side effects from other drugs, such as proton-pump inhibitors or warfarin.
**Diagnosis** Dizziness can arise from abnormalities in the brain (especially the brainstem or cerebellum), inner ear, eyes, heart, vascular system, fluid or blood volume, spinal cord, peripheral nerves, or body electrolytes. It may accompany serious events like concussion, brain bleed, epilepsy, stroke, meningitis, or encephalitis. The most common subcategories are: 40% peripheral vestibular dysfunction, 10% central nervous system lesion, 15% psychiatric disorder, 25% presyncope/disequilibrium, and 10% nonspecific dizziness. Some vestibular c
- field
- Medicine
- known_for
- Common medical complaint affecting 20–30% of persons, with four main subtypes: vertigo, disequilibrium, presyncope, and nonspecific dizziness
- subtypes
- Vertigo (~25–50%), disequilibrium (<~15%), presyncope (<~15%), nonspecific dizziness (~10%)
Lore & Background
Dizziness is broken down into four main subtypes: vertigo (~25–50%), disequilibrium (less than ~15%), presyncope (less than ~15%), and nonspecific dizziness (~10%). Vertigo is the sensation of spinning or having one's surroundings spin about them, often associated with nausea and vomiting. Presyncope describes lightheadedness or feeling faint, relating to syncope (fainting). Disequilibrium is the sensation of being off balance, most often characterized by frequent falls in a specific direction, and is not often associated with nausea or vomiting. Non-specific dizziness such as persistent postural-perceptual dizziness may be psychiatric in origin, is a diagnosis of exclusion, and can sometimes be brought about by hyperventilation.
Reader's Guide
Many conditions cause dizziness because multiple parts of the body are required for maintaining balance, including the inner ear, eyes, muscles, skeleton, and the nervous system. Dizziness can be caused by a variety of problems and may reflect a focal process (such as one affecting balance or coordination) or a diffuse one (such as a toxic exposure or low perfusion state). Common causes include inadequate blood supply to the brain, disorders of the inner ear, dehydration, and side effects from medications. The most common subcategories are: 40% peripheral vestibular dysfunction, 10% central nervous system lesion, 15% psychiatric disorder, 25% presyncope/disequilibrium, and 10% nonspecific dizziness. While traditional medical teaching has focused on determining the cause based on category, research published in 2017 suggests this analysis is of limited clinical utility.
Did You Know?
- Dizziness affects 20–30% of persons.
- Vertigo accounts for approximately 25–50% of dizziness cases.
- Disequilibrium is characterized by frequent falls in a specific direction and is not often associated with nausea or vomiting.
- Non-specific dizziness may be psychiatric in origin and is a diagnosis of exclusion.
Frequently Asked Questions
What is Dizziness?
Dizziness is an umbrella term covering a range of disorienting sensations, including vertigo, lightheadedness, and a general feeling of being off-balance. It can also describe a vague sense of giddiness or foolishness.
What are the four main subtypes of Dizziness?
The condition breaks down into vertigo (the most common at roughly 25–50% of cases), disequilibrium, presyncope, and nonspecific dizziness. The latter three each account for a smaller share, with disequilibrium and presyncope under 15% and nonspecific dizziness around 10%.
How many people experience Dizziness?
It is a very widespread complaint, with roughly 20 to 30 percent of people reporting it at some point. That makes it one of the most frequently encountered medical sensations overall.
What does Vertigo specifically feel like?
Vertigo is the spinning subtype, where either you or your surroundings seem to rotate. It often comes with nausea and vomiting alongside the spinning sensation.
How is Dizziness different from Vertigo?
Dizziness is the broad category covering all disorienting sensations, while vertigo is just one specific subtype within that category. In other words, all vertigo is dizziness, but not all dizziness is vertigo.
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