What causes vertigo

Overview

Vertigo is a sensation of spinning or movement that is often described as dizziness. It's not a disease itself but rather a symptom of an underlying condition, most frequently related to the inner ear or, less commonly, the brain. The feeling can range from mild lightheadedness to an intense, debilitating spinning sensation, often accompanied by nausea, vomiting, and imbalance.

Common Causes of Vertigo

Inner Ear Disorders (Peripheral Vertigo)

The vast majority of vertigo cases stem from issues within the inner ear, which houses the vestibular system. This intricate system is responsible for sensing head movements and spatial orientation, sending signals to the brain to maintain balance. When this system is disrupted, vertigo can occur.

Benign Paroxysmal Positional Vertigo (BPPV)

BPPV is the most frequent cause of vertigo, accounting for approximately 50% of all cases. It occurs when tiny calcium carbonate crystals, called otoconia, become dislodged from their normal location within the inner ear and float into one of the semicircular canals. These canals are filled with fluid and are sensitive to movement. When the head is moved in certain ways, the dislodged crystals move within the canal, sending false signals to the brain that create a sensation of spinning. This type of vertigo is typically brief, lasting only a minute or so, and is triggered by specific head movements like rolling over in bed, looking up, or bending down.

Vestibular Neuritis and Labyrinthitis

These conditions involve inflammation of parts of the inner ear. Vestibular neuritis is inflammation of the vestibular nerve, which transmits balance information from the inner ear to the brain. Labyrinthitis is similar but also involves inflammation of the labyrinth, the part of the inner ear that contains both the balance and hearing organs. These inflammations are often caused by viral infections, such as the flu or herpes viruses. Symptoms can include sudden, severe vertigo, nausea, vomiting, and loss of balance. Labyrinthitis may also be accompanied by hearing loss and tinnitus (ringing in the ears).

Meniere's Disease

Meniere's disease is a chronic inner ear disorder that affects balance and hearing. Its exact cause is unknown, but it's thought to be related to an abnormal buildup of fluid (endolymph) in the inner ear. Episodes of vertigo in Meniere's disease are typically more severe and longer-lasting than in BPPV, often lasting from 20 minutes to several hours. Other symptoms include fluctuating hearing loss, tinnitus, and a feeling of fullness in the ear.

Other Inner Ear Issues

Less common inner ear causes include perilymphatic fistula (a tear in the membrane separating the middle and inner ear), superior canal dehiscence syndrome (thinning or opening of the bone over the superior semicircular canal), and otosclerosis (abnormal bone growth in the middle ear).

Central Vertigo (Brain-Related Causes)

While less common than peripheral vertigo, central vertigo originates in the brain, specifically in the parts responsible for processing balance information, such as the brainstem and cerebellum. These causes are often more serious.

Vestibular Migraine

Migraine is not just a headache; it can also manifest as vertigo. Vestibular migraine is a condition where individuals experience vertigo as part of their migraine episodes, even without a typical headache. It can occur before, during, or after a migraine headache, or even as the sole symptom. The vertigo can be triggered by the same factors that trigger migraines, such as stress, certain foods, or hormonal changes.

Stroke and Transient Ischemic Attack (TIA)

Damage to the brainstem or cerebellum due to a stroke or TIA can disrupt the brain's ability to process balance signals, leading to vertigo. Vertigo associated with stroke may be accompanied by other neurological symptoms like weakness, numbness, difficulty speaking, or vision changes.

Multiple Sclerosis (MS)

MS is a disease that affects the central nervous system, including the brain and spinal cord. Lesions or inflammation in the brainstem or cerebellum can interfere with balance pathways, causing vertigo.

Brain Tumors

Tumors in the cerebellum or brainstem can press on neural pathways involved in balance, leading to vertigo. However, vertigo is usually not the first or only symptom of a brain tumor.

Other Neurological Conditions

Other less common central causes include Arnold-Chiari malformation, epilepsy, and neurosyphilis.

Other Contributing Factors

While not direct causes of vertigo, certain factors can exacerbate or trigger vertigo symptoms:

• Medications: Some drugs, including certain antibiotics, antidepressants, sedatives, and blood pressure medications, can have dizziness or vertigo as a side effect.
• Head Injury: A blow to the head can disrupt the inner ear or brain, leading to vertigo.
• Anxiety and Stress: While not a cause of true vertigo, severe anxiety or panic attacks can sometimes mimic the symptoms of dizziness or lightheadedness.
• Dehydration and Blood Sugar Fluctuations: Severe dehydration or significant drops in blood sugar can lead to general dizziness that might be perceived as vertigo.

Understanding the cause of vertigo is crucial for effective treatment. If you experience persistent or severe vertigo, it's important to consult a healthcare professional for a proper diagnosis and management plan.