Nausea and vomiting during a cold may result from postnasal drip (drainage of mucus from the nose into the throat), throat irritation, or ingestion of mucus. Management includes maintaining adequate hydration, consuming light and bland foods, and taking an antiemetic medication such as ondansetron under medical supervision. Steam inhalation and adequate rest can help relieve associated symptoms. If the symptoms persist or worsen, consult your doctor to rule out other underlying causes.