LYCOS RETRIEVER 
Vomiting: Signs
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Vomiting is orchestrated by the vomiting center of the brain. It responds to signals coming from the gastrointestinal tract (the mouth, stomach, and intestines), the bloodstream (and medicines or infections it contains), from the balancing systems in the ear (think motion sickness), and from the brain itself (including unsettling sights, smells, or even thoughts).
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Ear infections that have migrated to the inner ear affect the organs of balance and can cause vomiting. A much more common sign is head tilt to the affected side (see articles on ear infections and surgery in this series).
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Vertigo [W]ith nausea and vomiting may ... accompany infarction of the lateral brain stem or cerebellum or both. Key findings are an acute onset of symptoms, clear cerebellar signs such as extremity and gait ataxia and gaze-evoked nystagmus. These patients must be carefully observed for the development of progressive brain stem dysfunction due to edema at the site of infarction. Consultation with a neurologist should be obtained.
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