<unk>  is a condition where a person has the sensation of movement or of surrounding objects moving when they are not. Often it feels like a spinning or swaying movement. This may be associated with nausea, vomiting, sweating, or difficulties walking. It is typically worse when the head is moved.<unk>  is the most common type of dizziness. The most common disorders that result in<unk>  are benign paroxysmal positional<unk>  (BPPV), Ménière's disease, and labyrinthitis. Less common causes include stroke, brain tumors, brain injury, multiple sclerosis, migraines, trauma, and uneven pressures between the middle ears. Physiologic<unk>  may occur following being exposed to motion for a prolonged period such as when on a ship or simply following spinning with the eyes closed. Other causes may include toxin exposures such as to carbon monoxide, alcohol, or aspirin.<unk>  typically indicates a problem in a part of the vestibular system. Other causes of dizziness include presyncope, disequilibrium, and non-specific dizziness. Benign paroxysmal positional<unk>  is more likely in someone who gets repeated episodes of<unk>  with movement and is otherwise normal between these episodes. The episodes of<unk>  should last less than one minute. The Dix-Hallpike test typically produces a period of rapid eye movements known as nystagmus in this condition. In Ménière's disease there is often ringing in the ears, hearing loss, and the attacks of<unk>  last more than twenty minutes. In labyrinthitis the onset of<unk>  is sudden and the nystagmus occurs without movement. In this condition<unk>  can last for days. More severe causes should also be considered. This is especially true if other problems such as weakness, headache, double vision, or numbness occur. Dizziness affects approximately 20–40% of people at some point in time, while about 7.5–10% have<unk> . About 5% have<unk>  in a given year. It becomes more common with age and affects women two to three times more often than men.<unk>  accounts for about 2–3% of emergency department visits in the developed world.
Vertigo
Dizziness
Ophthalmodynia periodica
Lightheadedness
Ocular myasthenia
Tinnitus
Sympathetic ophthalmia
Herpes zoster ophthalmicus