Dizziness (vertigo)

Dizziness is a term used to describe a range of sensations, such as feeling faint, woozy, weak or unsteady. Dizziness that creates the false sense that you or your surroundings are spinning or moving is called vertigo.

Dizziness is one of the more common reasons adults visit their doctors. Frequent dizzy spells or constant dizziness can significantly affect your life. But dizziness rarely signals a life-threatening condition.

Treatment of dizziness depends on the cause and your symptoms. It's usually effective, but the problem may recur.

Symptoms

People experiencing dizziness may describe it as any of a number of sensations, such as:

• A false sense of motion or spinning (vertigo)
• Lightheadedness or feeling faint
• Unsteadiness or a loss of balance
• A feeling of floating, wooziness or heavy-headedness

These feelings may be triggered or worsened by walking, standing up or moving your head. Your dizziness may be accompanied by nausea or be so sudden or severe that you need to sit or lie down. The episode may last seconds or days and may recur.

Causes

Dizziness has many possible causes, including inner ear disturbance, motion sickness and medication effects. Sometimes it's caused by an underlying health condition, such as poor circulation, infection or injury.

The way dizziness makes you feel and your triggers provide clues for possible causes. How long the dizziness lasts and any other symptoms you have also help pinpoint the cause.

Inner ear problems that cause dizziness (vertigo)

Your sense of balance depends on the combined input from the various parts of your sensory system. These include your:

• Eyes,which help you determine where your body is in space and how it's moving
• Sensory nerves,which send messages to your brain about body movements and positions
• Inner ear,which houses sensors that help detect gravity and back-and-forth motion

Vertigo is the false sense that your surroundings are spinning or moving. With inner ear disorders, your brain receives signals from the inner ear that aren't consistent with what your eyes and sensory nerves are receiving. Vertigo is what results as your brain works to sort out the confusion.

• Benign paroxysmal positional vertigo (BPPV). This condition causes an intense and brief but false sense that you're spinning or moving. These episodes are triggered by a rapid change in head movement, such as when you turn over in bed, sit up or experience a blow to the head. BPPV is the most common cause of vertigo.
• Infection.A viral infection of the vestibular nerve, called vestibular neuritis, can cause intense, constant vertigo. If you also have sudden hearing loss, you may have labyrinthitis.
• Meniere's disease.This disease involves the excessive buildup of fluid in your inner ear. It's characterized by sudden episodes of vertigo lasting as long as several hours. You may also experience fluctuating hearing loss, ringing in the ear and the feeling of a plugged ear.
• Migraine. People who experience migraines may have episodes of vertigo or other types of dizziness even when they're not having a severe headache. Such vertigo episodes can last minutes to hours and may be associated with headache as well as light and noise sensitivity.