<unk>  occurs due to a difference between actual and expected<unk> . Symptoms commonly include nausea, vomiting, cold sweat, headache, dizziness, tiredness, loss of appetite, and increased salivation. Complications may rarely include dehydration, electrolyte problems, or a lower esophageal tear. The cause of<unk>  is either real or perceived<unk> . This may include from car travel, air travel, sea travel, space travel, or reality simulation. Risk factors include pregnancy, migraines, and Meniere’s disease. The diagnosis is based on symptoms. Treatment may include behavioral measures or medications. Behavioral measures include keeping the head still and focusing on the horizon. Three types of medications are useful: antimuscarinics such as scopolamine, H1 antihistamines such as dimenhydrinate, and amphetamines such as dexamphetamine. Side effects, however, may limit the use of medications. A number of medications used for nausea such as ondansetron are not effective for<unk> . Nearly all people are affected with sufficient<unk>  and most people will experience<unk>  at least once in their lifetime. Susceptibility, however, is variable, with about one-third of the population being highly susceptible while most other people are affected under extreme conditions. Women are more easily affected than men.<unk>  has been described since at least the time of Homer (ca. 8th century BC).
Motion sickness
Stroke
Sweating sickness
Benign paroxysmal positional vertigo
Ski sickness
Migraine-associated vertigo
Foreign accent syndrome
Morning sickness