Evaluation and Treatment of Nausea and Vomiting in Adults.

Nausea and vomiting are common symptoms that can reduce quality of life and indicate life-threatening illness. Acute nausea and vomiting last up to 7 days. In the absence of alarm symptoms, they are typically treated symptomatically and without an extensive evaluation. Typical causes include gastroenteritis or other viral syndromes, foodborne illness, acute migraine headaches, vestibular disturbances, early pregnancy, and adverse effects of medication. Chronic nausea and vomiting last 4 weeks or longer and have a broad differential diagnosis. Causes can be gastrointestinal, infectious, metabolic, neurologic, psychiatric, or related to medications and toxins. A careful history of related factors is essential to guide the initial evaluation and narrow the differential diagnosis. These factors include associated symptoms, timing of onset and duration of symptoms, exacerbating or relieving factors, alarm symptoms, medication and substance use, relationship with recent food ingestion, and comorbidities. Nonpharmacologic management options include fluid and electrolyte replacement; small, frequent meals; and avoidance of trigger foods. Antiemetic drugs effectively reduce symptoms of acute nausea and vomiting, but chronic symptoms are often more challenging to treat. When a specific etiology is not identified, a serotonin antagonist or dopamine antagonist can be used. However, medications may also target the suspected cause of symptoms and the neurotransmitters involved in central and peripheral pathways of nausea and vomiting. Pharmacologic therapy should be used for the shortest time necessary to control symptoms.